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GeneralRustler Mine, Gold Hill District

23rd Sep 2008 23:56 UTCStuart Mills Manager

Are there any experts about on the Rustler Mine http://www.mindat.org/loc-29621.html? Does anyone know of references to the mineralogy?

Thanks,

Stuart

24th Sep 2008 00:10 UTCDavid Von Bargen Manager

Deposit:: NOLAN 1935, THE GOLD HILL MINING DISTRICT, TOOELE CO., UTAH: USGS PP. 177}{Deposit:: EL SHATOURY AND WHELAN, 1970, MINERALIZATION IN THE GOLD HILL MINING DISTRICT, TOOELE CO, UTAH: UTAH GEOL. AND MINERAL SURVEY BULL. 83 P11-12}

24th Sep 2008 00:16 UTCStuart Mills Manager

Thanks David: Nothing since then? How are all the U minerals ideentified?

24th Sep 2008 00:25 UTCDavid Von Bargen Manager

Don't see any U minerals on list.

24th Sep 2008 00:27 UTCStuart Mills Manager

By U i mean Mo (sorry)....mendozavilite, paramendozavilite....

24th Sep 2008 01:04 UTCDavid Von Bargen Manager

Mendozavilite is listed in Handbook of Mineralogy. Hard to track their source info. Might try Georef.

Mineralogical Record

MENDOZAVILITE

United States

Utah

Gold Hill 20: (70), 20:391(show report saying Shannon was selling some at Tucson)

24th Sep 2008 03:51 UTCStuart Mills Manager

Hmmm.....maybe someone got some XRD done?

24th Sep 2008 05:57 UTCBrent Thorne Expert

Hello Stuart,

I have collected at the Rustler several times. The mine is collapsed, but there are some quartz-schorl boulders near the entrance. The quartz contains some molybdenite, pyrite, powellite, and mendozavilite. Dave Shannon collected there in the 70's and 80's and made the identification after collecting the material. I do not know how the analysis was done, but the material was offered for sale by Dave for years after it was collected. I have not analyzed the specimens that I have collected, but I made the identification from comparing a specimen of mendozavilite that I purchased from Dave Shannon in the 90's.

Brent

24th Sep 2008 06:23 UTCStuart Mills Manager

Hi Brent,

Thanks for the info. Your mendozavilite in the picture are there single crystals or is it an intergrown mass? It is hard to tell from the picture.

Cheers,

Stuart

24th Sep 2008 16:22 UTCBrent Thorne Expert

Hello Stuart,

It is a group of crystals. However, even at 144X the crystal form can not be recognized.

Brent

24th Sep 2008 17:49 UTCStuart Mills Manager

Hi Brent,

So probably too small to do anything with. Do you have anything bigger?

Stuart

25th Sep 2008 03:54 UTCBrent Thorne Expert

Hello Stuart,

The specimen that I have posted on Mindat is typical from this locality. Perhaps the medozavilite from the type locality would have larger crystals.

Sorry I could not be of more help.

Brent

25th Sep 2008 05:53 UTCStuart Mills Manager

Hi Brent,

No worries. It's always good to check multiple localities.

Stuart

25th Sep 2008 08:56 UTCJohn Sobolewski Expert

I can provide some information because it was I who provided David Shannon with the first Mendozavilite specimens.

When I visted David in Mesa in the 1980's, he showed me his private collection and said the he was looking for a specimen of Molybdite because all the specimens of "Molybdite" he had analysed turned out to be Ferrimolybdite. I told him I had some from the Rustler Mine that I collected a few years earlier and was certain that it was Molybdite because it had a negative test for iron using both potassiun ferro and ferricyanide tests. When I returned home, I send him a bunch of samples.

When I saw Dave outside the Executive Inn at the Tucson show the following year, he told me he had a big surprise for me and led me to his room. There I saw the sign "Mendozavilite. World's second locality - Rustler Mine, Utah". I still have the sign somewhere in my garage. He told me he did not trust my identification and sent a small sample of the material I had sent him to Peter Dunn at the Smithsonian to make absolutely sure it was Molybdite. He was pleasantly surprised when the results came back that it was the world's second occurrence of the rare mineral Mendozavilite.

I gave Dave directions to the mine and he collected more material on a few of occasions when going back to Arizona from the Pacific NW FM Mineral Symposium which he attended as a dealer when it was held in Tacoma.

When I went back to the Rustler Mine 4 years ago, I had to walk in because the mine spur road was not passable unless you had a high clearance 4 WD vehicle. I could find no trace of Mendozavillite nor the Powellite pseudomorphs after Molybdenite that occurred in the small area

where I collected them 2 decades earlier. John Sobolewski.

25th Sep 2008 18:20 UTCStuart Mills Manager

Thanks John for the interesting story. Do you know if Pete Dunn also found the paramendozavilite?

25th Sep 2008 18:56 UTCJohn Sobolewski Expert

Sorry Stuart, I do not know if Pete Dunn identified the paramendozavilite. I have labelled my specimens from my original find as mendozavilite. John S.

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