Mine detail: Ashland-Ten Broeck Mines

Previously called 'Ten Broeck, MS 19961Brawner, MS 19962Parole Extension, MS 19962Patented Claims: Ashland, MS 1109Ashland MineTen Broeck MineBrawner Crosscut Tunnel'

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Location

Lat / long:

37.41973, -108.01286

Resource(M)

Primary:	Gold, Silver
Secondary:	Lead, Copper
Tertiary:	Mercury, Tellurium
Ore:	Chalcopyrite, Galena, Pyrite
Gangue:	Barite, Chalcedony, Quartz
Discovery year:	1880

Production

Operation type:	Underground
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1881
Last production ended:	1917

Geology

Host rock:	Cutler Formation
Host type:	Mudstone,Shale,Sandstone
Associated rock:	Porphyritic Rocks--Diorite-Monzonite Porphyry;Nonporphyritic Rocks--Diorite
Associated type:	Diorite
Structure:	San Juan Uplift, Four Corners Platform, La Plata Dome, Lewis Mtn Diorite Stock
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Silicification

References

MRDS	D010799
MAS	80670025
DEP	10014150
Reference	{Deposit:: ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-76, 85-88, PL. 15.}{Deposit:: BLM MINERAL SURVEYS MS 1109, 19961, 19962}{Deposit:: Neubert and others, 1992, Mineral Appraisal of the San Juan National Forest, Colorado: USBM MLA 2-92, p. 111, fig. 39.}{Production:: ECKEL AND OTHERS, 1949, P. 85 (AS COMPILED FROM GOVT. RECORDS)}
Reporter	Wilson, Anna B., Neubert, J.T., Schwochow, Stephen D.