Showing posts with label mining. Show all posts
Showing posts with label mining. Show all posts

Tuesday, September 8, 2020

New Song Category: Gold or Mining Song | Seminole Wind

John Anderson: Seminole Wind (lyrics)
Album: Seminole Wind, 1992

I'm claiming a new song category: Gold Songs. And kind of like the Road Song category—songs that have to mention roads, streets, etcetera—gold songs are those that mention gold, gold mining, and possibly just mining in general. As a new category, at least on the blog, the definition has not yet been set in stone, so to speak. Another example of a "gold song" would be Heart of Gold by Neil Young.

This particular gold song, Seminole Wind, specifically mentions "days of old" and men digging for gold and silver, after which they "leave the empty holes," i.e. mine shafts, glory holes, or open pits. The song particularly emphasizes a couple negative aspects of gold and mining, though it really focuses on a hope that the Seminole Wind, and possibly the ghost of Osceola, will come and blow currently existing things to shit. (At least that's my interpretation.)

And so, when you happen to be gathering in places where the wind can blow ferociously—for example in Florida, in tornado country and the Midwest in general, in the Mojave Desert, and even in Nevada—watch out.

Friday, March 23, 2018

Links: Field tripping in Nevada, mostly along I-80 and Highway 50

A River Runs through It [link to download], ESW 2016, E-59 NBMG: Truckee River Reno to Pyramid Lake

1915 Pleasant Valley earthquake centennial field trip guidebook: A public field trip to visit the largest earthquake in Nevada's history [link to download] E-58 NBMG: 50 miles south of Winnemucca

Fire and Ice—Geology of the Mount Rose quadrangle, Lake Tahoe, and the Carson Range [link to download pdf], ESW 2015, E-57 NBMG: Galena Creek Visitor Center to Incline Village

Carson Rocks! A Sesquicentennial Celebration of some of our Capital City's Geological High Points [link to download pdf], ESW 2014, E-56 NBMG: around Carson City

Geo- and Eco-Mapping around DRI (The Great Altered Rock Walking Tour) [link download pdf], 2014, E-55, NBMG: around DRI.

Mapping the Geology around the Desert Research Institute and Truckee Meadows Community College [pdf], ESW 2013, E-53, NBMG: around DRI.

"Tuff All Over": Exploring Faulted Volcanic Terrain in the Painted Hills, Virginia Mountains, West of Pyramid Lake [pdf], ESW 2012, E-52, NBMG: near Pyramid Lake.

"Life's a Beach": In Search of Ancient Shorelines and Volcanoes in the Grimes Point and Lahontan Mountains Area [pdf], ESW 2011, E-51, NBMG: near Fallon.

Geo-tripping in Nevada [pdf], NBMG map guide to many or most of the NBMG field trip guides in Nevada through E-50.

In search of Tufa, Tuff, and Tough Rocks [link to download pdf], ESW 2010, E-50, NBMG: stops are east of Pyramid Lake; trip guide includes Reno to Pyramid Lake, Pyramid Lake to Wadsworth, Pyramid Lake to Brady's Hot Springs, Brady's Hot Springs to Reno.

Digging Deeper into the Comstock [link to download pdf], ESW 2009, E-48, NBMG: Reno to Gold Hill.

No Child Left Inside: A field trip for Families and Rockhounds [link to download pdf], ESW 2008, E-47, NBMG: stops are near Fallon, east of Fallon, north of Fallon, and in the Truckee River Canyon along I-80; road guide runs from Reno to east of Fallon, Fallon to Trinity (junction of I-80 and 95), and Trinity to Reno.

Taking the Pulse of the Earth [link to download pdf], ESW 2007, E-46, NBMG: south of Reno (Slide Mountain, Steamboat, and Virginia Foothills; the latter two not available to public).

Rockin' Along the River [link to download pdf], ESW 2006, E-45 NMBG: Truckee River Verdi to Wadsworth

The great Highway 50 rock tour [link to download], ESW 2005, E-44 NBMG: Fallon to Middlegate

The Frenchman lake frolic [link to download], ESW 2004, E-43 NBMG: Frenchman Lake area, California, west of NV-CA border.

Get out, stay out, and stay alive [link to download], ESW 2003, E-42 NBMG: north of Reno towards Pyramid Lake.

In search of "the right tuff" but you can just "take it for granite" [link to download], ESW 2002, E-41 NBMG: north of Reno and to the west toward northern end of Red Rock Road.

Fossils and Ancient Lakes [link to download pdf], ESW 2001 field trip #2, E-40, NBMG: fossils near Nightingale.

Peavine Peak: Geology, plants, and mining history [link to download], ESW 2001 field trip #1, E-39, NBMG: Peavine.

Exploring east of the summit: A field trip guide to Steamboat Springs, Lake Tahoe, and the Comstock area [link to download pdf], ESW 2000, E-38 NBMG: Steamboat Springs, Lake Tahoe, Comstock.

Geology along America's loneliest highway [link to download pdf], ESW 2000 E-37 NBMG: Carson to Sand Mountain.

What's shakin' in the neighborhood? -- Road log [link to download pdf], ESW 1999 field trip #2, E-34 NBMG:  Reno, Mt. Rose fan/pediment, to Genoa fault scarp.

Turbulent times in the Truckee Meadows [link to download pdf], ESW 1999 field trip #1, E-33 NBMG: UNR to Verdi to Crystal Peak Mine.

Ancient lakes and volcanoes near Fallon: Field trip for families and rockhounds [link to download pdf], ESW 1998, E-28 NBMG: Fallon, Grimes Point, Soda Lake.

Link to NBMG's entire Educational series; most (all?) are available to download.

INQUA 2003 - Elko to Reno, Wadsworth Amp, Lone Mtn hwy 50, Reheis - no viewing online at Google books

Geothermal energy helps power Nevada | Elko Daily Free Press - Brady's Hot Spring, Beowawe, and "Hot Hole" in Elko

The Stories Behind I-80s Exit Sign Names - Part 1 | Backyard Traveler by Rich Moreno - various info about signs and areas, e.g., Nightingale and Brady's Hot Springs

Touring California and Nevada hot springs | Matt C. Bischoff - Brady's Hot Springs reaches 209*F (and other tidbits)

Tuesday, April 4, 2017

From the Road: Talus-y Goodness and More of the Roan Cliffs, and a Question (at the end)

I was looking back through some photos and realized I had some of the Roan Cliffs from the spring of 2006. These first two photos are taken from an impromptu campsite MOH and I found not far from the Rulison exit on I-70, and they somewhat approximate the views seen in Ron Schott's excellent gigapan of the cliffs. I'd embed the gigapan here, but Blogger seems to have some problem with either the iframe coding or the flash implied within the code (or maybe it's Chrome, and I'm being deluded as to what's possible). In either case, we're looking northwest toward the cliffs in the first photo (above), and northeast toward the cliffs in the second photo (below).
It was a very green spring, according to these photos, so the color balance doesn't match with my fall 2016 photos below, which were taken from near or at the Rulison exit. Also, my Nikon tends towards blue.
The reason I stopped for these particular photos during my semi-mega roadtrip of last fall was the talus. I found the striping caused by alternating zones of vegetated and non-vegetated slope areas to be fascinating in the way that perhaps only a geologist, geomorphologist, or photographer can. So I grabbed a few quick shots focusing largely on the talus slopes. More recently, I decided some approximated geologic contacts were in order.
In this photo (above), the cliff and talus slope below the cliff are formed on the Tertiary Green River Formation (Tg), and the colorful beds near the bottom of the photo consist of the Tertiary Wasatch Formation (Tw). The thin cyan line near the base of the cliff marks (hopefully) the top of the Mahogany ledge as extrapolated from this USGS preliminary geologic map, as deduced from this report (Fig. 9, p. 16)—which points out the top of the ledge in a cliff to the west—and as mapped from Ron's gigapan of the cliffs. A few other reports were helpful for exploring the general geology and reading some background info about the ledge and zone—it's called the Mahogany zone when intercepted in drill holes.
In this set of two photos, I've zoomed in on the striped talus section that was on the far right of the previous two photos. The vertical striping of the talus contrasts nicely with the horizontal layering of the Wasatch beds, don't you think? I've labeled the photos below. This time, a tiny bit of the Tertiary Uinta Formation (Tu) is barely visible at the top right. The stratigraphic contact between the Tg and Tw is crudely outlined in faded cyan: It crops out behind the foreground slope where we can't see it.

This set of two photos is not that different from the previous set, but here (below) I've sketched in the Mahogany ledge (as approximately extrapolated), and I've broadly labeled the geologic formations without drawing in the contacts. The circle is where an old mine, the Rulison Oil Shale Mine is shown on the topo map of the area  (USGS TNM 2.0 Viewer link). I can't see it there in the photo—though maybe it's just not apparent—but there is a tiny black area that *might* be an adit just beneath the arrow.
The cliffs in these 2016 photos lie northwest of the Rulison exit and occur between the first two 2006 photos.
In this last set of two photos, we're looking northeast from the Rulison exit, zooming in on cliffs that approximate what we can see in the second of the two 2006 photos. I once again focused in on striped talus, but then I really zoomed in on some switchbacked roads that I thought might be drill roads. It turns out that the switchbacks climb up to some underground workings into the Mahogany ledge, which I've marked approximately with a thin cyan line (below, with thicker lines marking formational contacts; Tu = Uinta Formation; Tg = Green River Formation). The line is taken directly from the previously linked-to preliminary geologic map of the Anvil Points Quadrangle (O'Sullivan, 1986). The map can be viewed directly in Google Earth, an option I always appreciate.

The underground workings here consist of several adits comprising the Anvil Points Oil Shale Mines. The mine was active intermittently from 1925 to 1982 (the last link includes some undated photos), with some clean-up operations running from 2008 to 2013.
How do you spell Talus-y? I see 3 options: talus-y, talusey, and talusy. I went with the first option in the title but prefer the last. Yes, I know it's not a *real* word.

Monday, November 28, 2016

The Left-Lateral Strike-Slip Garlock Fault Near Highway 395

While out on the last road trip, I started taking pictures from places where roads crossed the Great Basin Divide. Unfortunately, I soon gave that up because freeways, which I traveled not exclusively but considerably, are lousy places from which to take pictures. But thinking about divides also made me think about the Garlock Fault, and how I'd be crossing it on 395 heading south into the Mojave. Here I've pulled over as I'm about to cross the fault.
I've drawn the Garlock fault with a thick blue line, and a secondary strand (air-photo linear) with a thinner blue line.
Besides the two fault strands, you can see the towns of Randsburg and Johannesburg, which were founded in 1896. The Yellow Aster open-pit gold mine was operated by Glamis Gold from about 1987 to 1997.

The haze was thick and the day overcast, and it looked like the photos I was taking would be fairly lousy, but MS Photos was surprisingly able to revive the dark, lackluster originals (I usually don't rely on the Photos app, but in this case it worked better than my other free programs).

After crossing the fault on 395, I took the road toward Goler Heights and Garlock. (Goler Gulch in the El Paso Mountains at Goler Heights is unrelated to Goler Wash in the Panamint Range at the edge of Death Valley National Park.)
Looking west along the southern range front of the El Paso Mountains toward Goler Heights.
The Garlock Fault is mostly behind low hills in this shot, and it runs to the right of us about three quarters of a mile to the north.
I've drawn in two (or three) apparent strands (or air-photo linears―my interpretation may not be precise in all cases) in dashed blue lines; where thin, the fault is behind hills or out of view.
We're now back near the junction of the Goler Road with Highway 395, looking to the northeast.
I took this photo thinking that we might be seeing part of the Garlock Fault, when in fact what we're seeing is a couple of fault strands parallel to the Garlock (air-photo linears).
The Garlock Fault proper is out of view beyond the low hills.
A little more than a mile to the NNE from the place I took that last photo (above), there's a great example of a shutter ridge and offset drainages.
Google Earth image with a blue line I added using the "Path" function.
The same image with more scribbles.
This marked up Google Earth image shows a small portion of the left-lateral Garlock Fault (long blue line). The fault line is basically the same as shown here (Roder, 2012). If you blur yours eyes a little (and even if you don't), you'll probably see several lines or linears that are running parallel to the main fault trace. I drew a few of these in with thinner dark blue lines. I can easily spot a few more.

The fault has offset two drainages in a left-lateral sense; that is, the south side of the fault, moving to the northeast (right) has brought in a ridge that has blocked the dry wash in the center of the image, forcing it to flow to the northeast to get around the ridge. That ridge is labeled "shutter ridge," which is the term for a ridge that blocks a drainage in this fashion along any strike-slip fault, whether it's right lateral, like the San Andreas, or left lateral like the Garlock. A second drainage way off in the upper right corner of the image has been blocked and offset in the same fashion. That drainage appears to have two shutter ridges, one that is north of the main trace of the fault, and another that looks like it's south of the main trace (at least the way the main trace has been drawn; we can see by drawing in just a few air-photo linears that there may be a few complications, and faults often meander around a bit).

I got back onto Highway 395 and continued south toward my destination, figuring that I could get a photo looking back toward the Garlock from somewhere up near the turn-off to Randsburg. I finally found a pullout on the east side of the highway; it offered me a four-wheeling opportunity to drive a very narrow, rocky road to the top of a small hill. The photos I took from there looked really lackluster, so I didn't spend a lot of time trying to get a really good panorama. Consequently, the two photos I've stitched together below do meet up on the horizon, but they are way off in the foreground, primarily because I ended up moving to keep the dirt road I was on out of the picture. We can, nevertheless see where the Garlock and a couple parallel strands or linears are located.
Stitched photo. The center of the photo is looking just west of north.
The same photo with a few labels.
And that's basically it for the Garlock Fault, but there's a location near Goler Heights that might be a good spot to look around the fault, and there are probably some good locations near Garlock.
Looking northeast from Goler Heights along the Garlock Fault.
UPDATE: Be sure to view Ron Schott's GigaPan of this portion of the Garlock Fault.

Wednesday, August 31, 2016

Leadfield: Scams with a Side of Geology

I've personally run into several mining or exploration scams doing field work in the west; these were small-scale attempted hoaxes perpetrated by smalltime, would-be hucksters, most of whom lacked any finesse whatsoever and all of whom were technically outside the mining or exploration industry (most were posers trying to pass themselves off as prospectors, a few were lawyers or accountants, others were swindlers of unknown affinity). Stories about these scams are mostly unwritten and therefore unpublished. I’ve also heard rumors of a few other larger scale hustles or double-dealings effected by people in the mining or exploration business, people I usually knew only from a distance. The reports of these particular offenses have come to me by way of rumor and innuendo, so I don’t know enough about either the details or the truths behind the vague to extravagant allegations to write about them myself. Of the noteworthy historic scams I've lived through or read about, I’d have to say that the two that have impressed me the most have been the Bre-X scam and the Leadfield scam or swindle. One C.C (Courtney Chauncey) Julian was the main player at Leadfield.  More on that a little later.



As for our continuing Titus Canyon excursion, we had just barely arrived in the lower portion of the southeastern branch of Titus Canyon, sometimes known as Lost Canyon (Lengner and Troxel, 2008), where the ghost town of Leadfield sits.
A partly ruined "Cousin Jack" dugout sits right beside the road as we come to the main part of Leadfield.
Just beyond this first ruin, we come to a little pullout on the right. The Leadfield sign sits here, right in front of a fabulous polychrome bluff.
We're looking northwest, nearly straight down the Titus Canyon road. 
Let's look at a little geology before we read the sign. As in previous posts, the the geologic formation abbreviations and contacts below are mostly from Niemi (2012). I've sprayed a cyan line between the foreground and background because the two areas don't hook up completely due to viewing angle. The two faults I've drawn are not the same fault: Though they appear to hook up across the sprayed line, they don't. The fault in the foreground (thicker blue line) is a major fault, possibly what has been called the Lost Canyon Fault (Lengner and Troxel, 2008); the fault in the background (thinner blue line) is a fairly minor fault. Both faults are normal and down to the east (right).

The main branch of Titus Canyon, which is running entirely in front of us near the base of the bluff, heads about 5.25 miles north of our position. It comes into the photo on the right, runs behind the foreground colorful beds marked EOgtc and in front of the farther reddish beds, also marked EOgtc, then exits the photo on the left behind the gray slopes of Cb (so the main canyon is essentially behind my sprayed cyan line but this side of the bluff).
Same photo as before, with geologic labeling.
In this particular area, Niemi has shown two aerial photos in his report, with formation contacts drawn in some detail, so my contacts are pretty darned close to being at actual formational boundaries. We're looking at carbonate of the Cambrian Bonanza King Formation (Cb), which in the foreground is in fault contact with variegated sediments of the Eocene to Oligocene Titus Canyon Formation (EOgtc). The Titus Canyon Formation is overlain by greenish sediments of the Miocene Panuga Formation (Tg), which in this area contains three whitish marker horizons that may be tuffs. The Tg is overlain by the Miocene Wahguyhe Formation (Tw), which contains layers and masses of rhyodacite to latite flow rock correlating with the Rhyolite of Picture Rock (Trp). My contacts around the Trp are somewhat approximate. Above the Tw is a stack of several Miocene ash-flow tuff sheets that erupted from the southwestern Nevada volcanic field [Wayback Machine]; Niemi lumps these sheets into the Crater Flat Group (Tc), the Paintbrush Group (Tp), and the Timber Mountain Group (Tm).


What about the Leadfield story?
Here we can read a simple version of the history of Leadfield.
A lot has been said about Leadfield—you can read a little about it at many many places online—so I won't tell the whole tale here. And I won't direct you to most of the websites, because in my opinion most throw in a few casual statements that are incorrect from either a mining or exploration standpoint. Beyond that, the easily available reports also don't agree about all the details, with the specifics of the scam or swindle being reported quite variably as to timing and even as to who did what, so that without accessing primary sources, one can't even be sure who started the Western Lead Mines Company (WLMC), a key entity in the story. Two major sources agree on most of the facts, Lingenfelter (1988) and Tygiel (19941996), and I've come to rely largely on these two books, one of which I bought, the other of which I was able to read most key points between two different online sources – Google and Amazon. I've wondered if some of the discrepancies I’ve seen in other sources are because of the Leadfield Chronicle (the Library of Congress lists Leadfield, CA, as its place of publication, when it was actually published or printed in Tonopah, NV, according to Lingenfelter, 1988 and Bryan and Tucker-Bryan, 2015). The reporting by the Leadfield Chronicle was apparently nearly as wild as C.C. Julian’s own advertisements, and according to some sources (Lingenfelter, 1988; Earl, 2002), its editor was appointed by Julian, so it shouldn’t necessarily be considered neutral.
The view of what I call "the main dump" at Leadfield, a couple of still-standing buildings, and a nice, broad fold in the carbonate rocks of the Bonanza King Formation as a backdrop. Also, a fault: Can you see it?
The basics of the Leadfield saga are clear and generally agreed upon by all sides, all parties, but remember, definite sides did develop, seemingly right from the start. The agreed upon bits go like this. Early in the 20th century a couple prospector types discovered what they claimed to be shipping grade lead ore in Titus Canyon, in the portion of the canyon where now sits the ghost town of Leadfield. The distance to market was too great—meaning that what they found was technically not ore—so they abandoned their claims in favor of other areas with better potential economics. Some years later, a couple more prospectors  (onetwo, or three) came into the area. They, apparently encouraged by what they saw, staked claims and formed the now well known Western Lead Mines Company (WLMC). Eventually they brought in the flashy, well-known though controversial, oil promoter C.C. Julian. Promoters often have, or end up with, a bad name, and this one had already run afoul of the California Corporation Commission (part of the DOC; now the DBO) for his alleged over-issuance of stock during his previous venture, the promotion and operation of the oil company, Julian Petroleum ("Julian Pete"). Promoters can be useful, however, and they can be necessary for raising the money needed for exploration or mine development.

It's about here where disagreements begin, mostly as to C.C.'s character and complicity in what really looks like quite a stock scam—or swindle, as it is often called—but also as to the character or worth of the mining camp of Leadfield itself. One side, essentially touting Julian as the victim of a serious grudge on the part of the Commissioner of Corporations, Edwin M. ("Mike") Daugherty, and also the victim of being scammed by the prospectors who brought him into the WLMC, is best exemplified here (Latschar, 1981; this article or section, part of a large historic inventory report, references a large number of original sources, although its specific citations are quite general). The other side, which I have to lean toward with all I've been able to read, is covered by the two books I mentioned earlier ( (Lingenfelter, 1988Tygiel, 19941996).

I think there are some things worth noting in all of this, and these issues can be grouped under a few main headings: 1) advertising, leading to 2) were there really handbills or ads showing the Amargosa River, with steamships, flowing to Leadfield or Titus Canyon?, 3) what was the nature of any ore present at Leadfield, as to composition (mineralogy), grade, and size, leading to 4) did Julian really salt the dumps—and with ore from Tonopah?!

As for C.C. Julian's ads, today we would generally consider them excessively promotional in nature and extremely over-the-top (OT) overall. I've found actual examples of these ads only in books. I'm not sure which of the several ads I've seen are the most absurd or OT, but you can see a few examples by following this link (Tygiel, 1994). One thing to note is that Julian had taken an "art form" that had been practiced in the oil boom of L.A. (still ongoing during the Leadfield frenzy)—where almost anything went in attracting prospective buyers, investors, or suckers, depending on who you listened to—and had added his own style. Tygiel explains it this way, "His talents lay in writing advertising copy that encapsulated the hopes and dispelled the fears of the small investor." And then he gives a perfect example of quintessential Julian from his early oil promotion days (1922):
Julian Refuses to Accept Your Money
Unless You Can Afford to Lose!
Widows and Orphans, This Is
No Investment for You!
C.C. Julian continued with this bold style during the Leadfield days.

Many have stated, or repeated, that Julian moved the Amargosa and filled it with more water than it rarely has, allowing steamships to load ore directly at Leadfield or from the lower reaches of Titus Canyon. This assertion seems to be from Tucker (1971), who lists no sources. Tygiel, citing a 1956 source I haven't been able to locate online, mentions the possibility of steamships in parentheses:
(In some instances, Julian allegedly took even greater liberties. His promotional literature for the East reportedly depicted ocean steamships laden with lead ore docked in Death Valley.)
And Earl (2002) states that Lingenfelter had doubts about steamships on the Amargosa, although it's not clear to me where Lingenfelter expressed such doubts. Darn, I really wanted to see a picture!

More than Julian's splashy style of advertising, however, I think what has to be considered is what was actually said about the ores or potential ores at Leadfield, whether it was accurate or exaggerated. Sure, investing in any kind of oil or mining venture carries risk. And as an exploration geologist, I might tend to get more financial backing from a company if I downplay any negatives, really talk up the positives, and inflate the likely size or grade of a favorite target of mine. I might, however, not last long in the business if every property I want to drill is the "best" or "largest" or "highest grade" — or if every single one of my projects is a supposed world beater. Julian brought in several so-called "experts," who according to Tygiel not only weren't really experts in the exploration, mining, or engineering fields, but who considerably distorted or overestimated the value of what might be at Leadfield. The Leadfield orebody was reported as "very large," "one of the largest deposits of the west," and "the largest lead discovery in the United States" (Tygiel, 1994; Latschar, 1981; Tygiel, 1994). And then there are some reports that practically have suggested that there is nothing at all at Leadfield. Which is it?
What lies on this dump? What did the oldtimers hit while digging in these hills? Enquiring minds want to know.
Lots of grade numbers have been thrown around with regard to Leadfield. Many of the numbers are really quite average; a few are fairly high. I'm going to run through them to see what can be discerned. One first note: lead (Pb) and zinc (Zn) assays are often historically given in dollars per ton ($/ton); they are also noted in percent (% Pb). With the first method, you have to know the price of lead on the day of the assay, or you won't know how much lead was present (this is also true for any commodity where the value is stated in dollars, e.g. "30-dollar rock"). Prices of lead and zinc are usually listed as dollars per pound ($/lb). One, therefore, might need to do a little calculating to know what the assay really means. I personally have little doubt that there was (and probably still is) some lead, silver, and zinc at Leadfield (given what I've read and the sources used by the three main writers: Tygiel, Lingenfelter, and Latschar).

1905: Samples of the original prospectors at Leadfield assayed "as high as" $40/ton when taken to nearby Rhyolite (Latschar, 1981). $40/ton is the same as 40% Pb at an approximate average 1905 price of $0.05 per pound, and 40% Pb is a number that would be considered ore grade in almost any time period. So here's a thing: "Ore grade" means that if the economics are right and there is also enough of this type of rock, it is ore. The size and economics are unknown to an assayer, so we say "ore grade" not "ore." That way, we aren't lying. And here's another thing: Were these higher numbers gotten from samples that were "high-graded" or sampled selectively? We don't really know. When I go out and sample something, I can take several kinds of representative samples, which when looking for gold will often come up with nothing or very low values. Or I can take a "high-grade" or "select" sample of some kind, maybe choosing only vein material, maybe choosing rock that contains visible galena or some other mineral or characteristic I consider a favorable indicator of ore. This type of sampling is necessary: I want to know if anything is there. If something (Pb, Au, Cu...) is there, then I can go about trying to figure out how much is there and what the average grade is (usually by drilling).

After 1905, there were several estimates, or statements, or results of assays given.

1926 Probably early in the year, Julian’s experts "obligingly found no ore specimens assaying less than $30 a ton" (Lingenfelter, 1988). Now this is nowhere near as high as what was supposedly found in 1905, unless the statement or assay was really 30% Pb, not $30/ton! Thirty dollars per ton would have been about 16.7% Pb, where I used the average price of lead for 1925 of $0.09/lb. An assay of 16.7% was nothing to sneeze at, but it may not have technically been ore. (The 1925 average price I used was higher by a little than the average price for 1926. Lead was on a slow, downhill slide. I don't know the daily, weekly, or monthly value of lead, and don't know when the $30 value was calculated. So the actual percent might be, maybe, 15% to 20%.)

1926 Probably February, the average Pb value in the WLMC tunnels was given at 8 to 30% Pb by Latschar (1981). Here's something to think about for this range of 8 to 30 percent: That's quite a range for supposedly "average" values, but maybe that indicates that the values were not "high-grade" samples, but were instead representative sample taken along the ribs (walls) of the drifts or tunnels. Another thing to note: Given that 8% Pb translates to about $14.40/ton in average 1925 prices, and given that it supposedly would cost about $18/ton to haul rock to the rail terminal in Beatty (Latschar, 1981; the only estimate or statement of shipping costs I could find), the lower values are not ore. The higher values of 30% Pb, which translates to about $54/ton in average 1925 values, would have likely been ore.

1926 In late February, Walter Abel, mining engineer with the California Corporations Department “predicted” that the actual ore found at Leadfield would not exceed 200 tons with a net value of $16,400 (Tygiel, 1994). Let's see what that means (other than his obvious implication that the ore deposit, if there really was one, would be quite small). What we know is that 200 tons of x% ore would generate $16,400. The rock, therefore, was $82-dollar rock; it would assay at $82 per ton. This is definitely ore grade, and depending on size of the deposit, it might be ore. As for the actual percentage of lead in the rock, let’s do the math. I don’t really know what price Abel used to come up with his $16,400 number, so we’ll use a high value of 0.1 lb/ton, a nice round number that is somewhat higher than the average 1925 price of Pb. Our ore is worth $82/ton, so at a price of $0.10 per pound, we have 82/0.1 or 820 pounds per ton, and 820 pounds in 2000 pounds (1 ton) equals 41% Pb. If we use the average price of $0.090/lb for 1925, we would get an value of 45.56% Pb; and at the average price of $0.084/lb for 1926, we would get 48.8%. Abel was therefore predicting, implying, or calculating a small ore deposit of relatively high grade: about 200 tons of something like 40 to 50% Pb.

1926 In September or Octobter, the Pacific Lead Mines, Inc. reported "lead assays" of 8% (Latschar, 1981) – again, this is about $14.40/ton using the higher 1925 average Pb price of $0.09/lb: not ore.

1926 In late October, once again according to Latschar, the WLMC hit their target ledge and it contained only 2% Pb; this "mineralized waste rock" (as we often say in the business) was worth ~$3.60/ton using average 1925 prices, probably less than that, given the slow slide in the price of lead.

1938 (From Weight, 1977) "Probably the best estimate of its surface value was made by the California Division of Mines in 1938: 'At various points for a distance of about two miles, galena is disseminated in hard blue limestone. The ore bodies exposed carry from five to seven percent lead, with five ounces of silver (per ton) and five to six percent zinc.'" Here's what our calculations will tell us: 6% Pb = $10.80 @ 0.09 $/lb (1925); 5 opt Ag = $3.45 @ 0.60 per ounce (1925); 5.5% Zn = $8.36 @ 0.76 $/lb (1925). This means the ore bodies noted in 1938 were worth about $22.61 per ton in average 1925 prices. With shipping to Beatty at $18/ton, and including other mining costs (development and driving tunnels, paying miners, blasting, milling and/or concentrating, and smelting) of at least $5/ton (my low-ball estimate, IANAE, I am not an engineer) these Pb-Zn-Ag orebodies did not likely qualify as ore.

It does sound for sure, to me, like the size of the projected, undeveloped deposit or unconnected deposits at Leadfield were overstated by Julian’s “experts,” but maybe not so much the grade. And, the advertising he put out was wild, but advertising and tours were expected. Did he salt the area with ore "from Tonopah"? The only secondary reference I can find for this assertion is Tucker (1971), again with no primary sources given. Other references to the salting appear to be quoting or paraphrasing her. Latschar goes so far as to say, "He in no way salted the mines [...]" when referring to the possibility. Earl (2002) once again states that Lingenfelter "feels" that Julian did not salt the area, but this is a reference I haven't been able to check. I just wonder why taking volcanic-hosted vein ore from the Ag-Au district of Tonopah into the carbonate-hosted, non-vein (manto? chimney? ledge?) Pb-Zn-Ag country at Leadfield would even be considered. The prospectors and miner-types driving the adits and trying to hit the ledges would have noticed the incongruous vein rock; perhaps the people that came up on the train from L.A. wouldn't have.

My conclusion: The area was worth prospecting and developing to the extent that one could find whether it was worth mining, but I wouldn't use my money for the project. This conclusion is similar to that of Ira B. Joralemon, a respected mining engineer, who said that WMLC was a prospect worthy of "careful development," provided that exploration expenses be kept at or below $100,000 (Tygiel, 1994).



Back to a bit of geology:
The main dump is on the left; the far west cabin is off-picture to the right.
The geology (next photo) is kind of simple: broadly folded carbonates of the Cambrian Bonanza King Formation (Cb) are in fault contact with poorly outcropping Titus Canyon Formation (EOgtc). The main adit above the main dump appears to be driving toward the carbonates or the fault itself. The yellowish-orange color on the left side of the dump might be from oxidation of sulfides. If sulfides were intersected when reaching a target ledge near the end of the tunnel or adit, they might be found way down at the lower outside edge of the dump (if any sulfides were hit).

The adit at the far west cabin appears to start in Tertiary megabreccia; that's what was mapped (Reynolds, in Lengner and Troxel, 2008), and it does look like a breccia in photos I have. We'll see those photos next time. Possibly that adit is driving for the carbonates or fault, or even for the orangey-looking ledge just above or along the trace of the fault.
Geology! Most of the foreground is Quaternary alluvium and colluvium.
The orangey rock, located between the main dump and the farthest west cabin, kind of above the adit at the far west cabin would be the sort of thing that might have looked attractive to the original prospectors.
Next time we'll walk out to the far west cabin.

Selected References:
Bryan, T.S., and Tucker-Bryan, Betty, 2015, The explorer's guide to Death Valley National Park, Third Edition: University Press of Colorado, 496 p. [ref for location of publication of the Leadfield Chronicle]

Earl, P.I., 2002, C.C. Julian and the great Leadfield swindle: Death Valley’s last mining rush, in Proceedings, Death Valley Conference on History and Prehistory (6th), p. 79-99. [ref that Leadfield Chronicle editor appointed by Julian; some speculations about the salting and steamships on the Amargosa]

Latschar, John, 1981, Leadfield, in Latschar, John, and Greene, Linda (eds.), Historic Resource Study: A History Mining in Death Valley National Monument, California - Nevada: National Park Service.

Lengner, K., and Troxel, B.W., 2008, Death Valley's Titus Canyon & Leadfield ghost town: Deep Enough Press, 175 p.

Lingenfelter, R.E., 1988, Death Valley and the Amargosa: A land of illusion: University of California Press, 622 p.

Niemi, N.A., 2012, Geologic Map of the Central Grapevine Mountains, Inyo County, California, and Esmeralda and Nye Counties, Nevada: Nevada, Geological Society of America Digital Maps and Charts Series, DMC12, 1:48,000, 28 p. text.

Tucker, B.J., 1971, Death Valley's Titus Canyon: Desert Magazine, v. 34, no. 4 (April), p. 26-27. [reference to salting, moving the Amargosa and using steamships to haul ore]

Tygiel, Jules, 1994, The great Los Angeles swindle: Oil, stocks, and scandal during the roaring twenties: University of California Press, 398 p. (The 1996 edition is the one I purchased, same pagination.)

Weight, H.O., 1977, Leadfield died of complications: Desert Magazine, v. 40, no. 11 (November), p. 34-38. [ref to 1938 CA Div Mines assessment]

Woodruff, D., 2013, Titus Canyon, in 2013 Death Valley Visitor's Guide: Golden Gate Media Group, p. 4-11. [nice pics, ref to a Julian expert stating 1 million tons of milling ore at $30 per ton; also to state engineer finding only 200 tons, etc.]

Location map

Related Posts:
The Approach to Titus Canyon: Tan Mountain
The Approach to Titus Canyon: Up and over White Pass
The Approach to Titus Canyon: To Red Pass
The Approach to Titus Canyon: Just Below Red Pass
A Hike at Red Pass, Titus Canyon Road, Death Valley, CA
Titus Canyon Road: A Little History and a Few Maps
Down into Titus Canyon: We Leave Red Pass Behind (Finally!)
Titus Canyon: The Upper Part of Lost Canyon

Tuesday, May 31, 2016

The Approach to Titus Canyon: Amargosa Narrows, Bullfrog Pit, and the Original Bullfrog Mine

We're officially on the Titus Canyon leg of our larger Death Valley trip—a round trip odyssey that will take us to and near a number of places. This section of our journey began with the last post, which was centered around Beatty. I’ll be complementing my February photographs with photos from a similar journey MOH and I took back in the late spring of 2009. So, let's get on with it! We'll begin by leaving Beatty.

There are two ways to get to the Titus Canyon road from Beatty. I usually forget that fact because it's generally been years between journeys into the canyon. Consequently, I seem to end up on this route one time, and that route the next time, alternating routes without really thinking about it. Then I wonder why the road, the signs, and the overall lay of the land don't look the same as the last time I passed through the area.
Beatty's main intersection: a 4-way stop.
We went one way in 2009, turning left at Beatty’s main intersection, which kept us on U.S. 95 as we drove east and then south through and out of town. We passed the dirt turnoff to Fluorspar Canyon (might there be some fluorite up there?) and passed into the Amargosa Narrows. Not far beyond the Narrows, we turned right onto the unsigned paved road to the Beatty Airport, which goes by an obscure ghost town, Gold Center. Airport Road turns to dirt beyond the airport.
The Amargosa Narrows: Precambrian Z rocks crop out on the right, left, and straight ahead.
We went the other way this past February, going straight on Nevada S.R. 374, the Daylight Pass road, at the same intersection. This paved road winds through a bit of the Bullfrog Hills, going by Velvet Peak and Paradise Mountain. It then meets up with Airport Road near the Bullfrog pit of the currently inactive Bullfrog open pit gold mine.
The Bullfrog pit, as seen from the dirt portion of Airport Road, looking across a sea of blooming creosote (from the early May trip, 2009).
The Bullfrog gold mine—AKA the Barrick Bullfrog gold mine—was in operation from 1988 or '89 through 1998, when it produced about 2.4 million ounces of gold from two main open pits, the Bullfrog pit and the Montgomery-Shoshone pit, and from at least one related underground project, the North Extension. Discovery of these ore deposits began in 1982 with St. Joe Minerals Corporation (overall history is described in some detail here, here, and here). The exploration property then passed through several companies in quick succession through a series of acquisitions or buyouts, going from St. Joe to Bond Gold Corporation, then to Lac Minerals Ltd (or LAC Minerals Ltd, depending on the year—this company went back and forth with its name several times in a few years), and then to Barrick Gold Corporation.

The deposit is hosted in Tertiary volcanic rocks, mostly ash-flow tuffs that are cited by Castor et al (1989) as being correlative with the Miocene Timber Mountain Tuff, which has age dates ranging from about 10 to about 15 Ma (Geolex). In fact, the host formation was mapped by Maldonado et al (1990) as the Rainier Mesa Member of the Timber Mountain Tuff.

I had a tour of the Bullfrog pit back in the late 1980s or in 1990, while I was working for Former Mining Company. Bond Gold was probably the operator when I was there, and the mine was just called the Bullfrog mine. We learned then that much of the overall low-grade ore is concentrated in veins, breccias, and stockworks, and we thought at the time the deposit would be fairly difficult to make money at. It later surprised me that a large company like Barrick got involved in the mining. (I have no idea how the economics really played out; so much can depend on the up front expenditures a company has made and the price of gold during production.)

The deposit formed near the end of an extreme extensional event that took place in the area between 11.4 and 7.6 Ma (Castor and Weiss, 1992Weiss et al, 1995; Castor et al, 1999). Although ore is partly hosted in and controlled by structures in the upper plate of the Bullfrog Hills detachment fault, it's not generally considered to be a detachment-related type of ore deposit (although knowledge of detachment faulting and related structural models would be indespensible for making discoveries in the Bullfrog mining district).

A little farther down the Daylight Pass Road, about six miles from the center of Beatty, the Titus Canyon dirt road heads WSW toward the Grapevine Mountains.
Turnoff to the Titus Canyon road.
The Titus Canyon road is a dirt road of variable character, narrow and washboardy in many parts, and entirely one way east to west. It isn't possible to turn around once you get going, and from asphalt to about "Tan Mountain," [name from Panoramio photo no longer available] there are few pullouts. It's possible that one could exit the road in two or more places within this first section, but it's not clear to me that any of these possible exits are really roads.
High clearance 4x4 vehicles are recommended!
Although 4WD is not usually necessary along most sections of the road, high clearance is a must, and 4WD can become necessary at any time (especially during bad weather). I think the road is blocked from the east when bad T-storms or flash flooding are expected, but I'd always want to check the weather to avoid getting stranded during a bad washout, like the kind the Death Valley area experienced in October, 2015.

This is what the October flooding looked like, during and after:

Don't get caught up in one of these!

Somewhere between the Titus Canyon warning sign and the Death Valley sign, you can look off to the north and see some classic Nevada ash-flow tuff formations, in this case tilted moderately along two detachment faults. The visible roads and workings are in the area of the Original Bullfrog mine, a little less than four miles west, as the crow flies, from the Bullfrog open pit.
Tilted volcanic rocks on Bullfrog Mountain (the highest point in the photo), with the Original Bullfrog mine not far left of center.
Wildflowers and creosote are in bloom in this May, 2009 photo. More precise photo and location information can be had by perusing the map near the end of this post.

I got to fooling around, saving this Google Earth image of Bullfrog Mountain from a similar angle as my photo above.
Google Earth image of Bullfrog Mountain.
Then I fiddled a little more and shortly had a geologic map overlay of Bullfrog Mountain. The two USGS maps used here are the Geologic map of the northeast quarter of the Bullfrog 15-minute quadrangle (Maldonado et al, 1990) and the Geologic map of the northwest quarter of the Bullfrog 15-minute quadrangle (Maldonado, 1990).
The same Google Earth image with two kmz file overlays.
What fun! Okay, this was so much fun, I went ahead and made the image match my photo more precisely, and then added a few geologic labels.
The photo, again, for comparison with the image below.
Geologic overlay of Google Earth (G.E.) image, labeled.
This is a good part of the Bullfrog Hills in which to see the results of the extreme extension that occurred in the area during the Miocene, although I'm not sure if its possible to actually place a finger on the main (or secondary) detachment surface. For the most part, the detachment faults are shown on the maps as dashed beneath Quaternary cover. In only three areas is either detachment fault mapped in the hills where we might be able to go look at the fault planes, and in only two places are dip measurement shown, and both sites are in the low hills to the east of the photo and images.

As for the rest of the local geology, the mylonitized lower plate Precambrian rocks are easily reconnoitered in the light colored hill on the far left of my photo (lower left of the G.E. geologic image), and the tilted volcanic section is easily walked in the hills above the Original Bullfrog mine. The main volcanic formations, oldest to youngest (west to east, left to right), are as follows: Ts3, mostly sandstone, shale, and conglomerate; Tql, quartz latite lava flows; Tlr, the Lithic Ridge Tuff; Tbt2, bedded tuff; Tcb, the Bullfrog Member of the Crater Flat Tuff; Tbt3, bedded tuff; Tpc, the Tiva Canyon Member of the Paintbrush Tuff; Tbt4, bedded tuff; and Tmr, the Rainier Mesa Member of the Timber Mountain Tuff. The Op on these maps is the Ordovician Pogonip Group, here consisting of limestone only 60m thick. The Zm consists of Late Proterozoic metamorphic rocks that have mid- to late Miocene cooling ages related to the regional extension.

Bullfrog ore.
The lower trenches at the Original Bullfrog mine used to be a great place to stop when driving through the area. (The location dot in the last image shows the site of the original mine, not the lower trenches; the lower trenches are more easily seen in the last photo as the small color anomaly below the location of that dot.) The easily unearthed quartz-amethyst veins contain v.g. and other neat minerals (see this post and next week's post). Much of the mineralized material was mined out in the 1980s (or earlier?), and a bunch of it was placed on a nearby heap leach pad. I doubt that leaching was an efficient way of recovering gold and silver from this ore, and we used to bemoan the placing of all this great specimen material out to leach. Not long after my first introduction to the area, which was probably in about 1986 or a little later, someone—no, I really can't won't say who—came and scraped the leach pad, removing all the rock in order to recover and melt the gold and electrum down for a wedding ring (at least that's the story I've heard). I visited the area most recently on the last day of the last millennium (depending on when we say the millenium started). I camped on one of the drill roads after wandering around the roads, trenches, and prospects. I didn't find much. If you ever happen to stop by the area, remember that you're probably on patented (private) ground, at least up near the original mine site, although I don't remember seeing any signs.
The Death Valley National Park boundary on the Titus Canyon is marked by signs, a fence, and a cattle guard.
Here's where we'll stop our journey today, right at the eastern boundary of Death Valley National Park (as an oldtimer, I keep wanting to call it a National Monument).

Location map

Related Posts (in order of posting):
Death Valley, "Super" Blooms, Turtlebacks, and Detachments
Death Valley Trip, Part 2: More of the Badwater Turtleback Fault
Death Valley Trip, Part 3: Northward, and over Daylight Pass
Death Valley Trip, Getting There: Wave Clouds beyond the Sierra
Death Valley Trip, Getting There: A Hike to Pleistocene Shorelines

Death Valley Trip, Getting There: Walker Lake, Road Stories, A Bit about Copper, and Some Folds near Luning

Death Valley Trip, Getting There: A Jeep Trail, Folds and Cartoons of Folds, Even More Folds, and Boundary Peak

Death Valley Trip, Getting There: Highway 95, Redlich, Columbus Salt Marsh, and Another View of Boundary Peak

Death Valley Trip, Getting There: Coaldale, Black Rock, Lone Mountain, and the Boss Mine

Death Valley Trip, Getting There: Black Rock to Lida Junction to Beatty

Beatty: Old Buildings, A Fold, and Onward toward Titus Canyon