The data below represent everything available in the MBMG Abandoned and Inactive Mines (AIM) database.

Sites Table
AIM Id Name Alternate Name District County
BE000318 DEXTER MINE ARGENTA BEAVERHEAD
MRDS AMLI MILS Latitude Longitude Datum
300010147 45.3158 -112.8636
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
06S 10W 17 BBCD 5019508 353924 12
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
6878 F BLM DILLON DILLON ARGENTA
Property Type Update Date Who Updated
LODE 5/31/1995 CBD
Commodities Table
Commodities Identified
LEAD
SILVER
Agency Info Table
Information
Agency: BLM
Region District: BUTTE
Ranger District:
Forest Service Tract:
Watershed Code: 10020002
Forest or Resource Area: DILLON
Owner: B
Impact:
Report: Dexter (BE000318) The Dexter workings consist of several shafts connected by a 260' adit, crosscuts, and stopes; all underground workings except 1 shaft (grated and locked) are inaccessible. The total surface disturbance is about 1 1/2 acres. This mine site explores a vein consisting of garnetized limestone in the Devonian Three Forks Formation (Shenon, 1931). The vein is associated with a granodiorite stock. Fracturing and alteration were noted in the wall rock of the adit. Primary ore minerals were partly oxidized galena, pyrite, and tetrahedrite (Geach, 1972). An AIM grab sample assayed 658 ppm lead, 826 ppm zinc, 22 ppm copper, 2.4 ppm silver, trace gold, and 50 ppm arsenic. This mine was purportedly worked in the 1880's and well into this century. No published production figures were found. Judging from the size of the dumps, production must have been fairly substantial. This dry site is located on BLM land; there is no water component.
Assay Table
Information
Sample Id: WRDX-1
Material Type: WA
Sample Method: COMP
Comments:
Screening Criteria Table
Information
Mill Tailings: N
Adit Discharge: N
Metal Leaching: N
Water Erosion: N
Residence: N
Hazardous Materials: N
Open Adit: Y
Visit: Y
Comments: MBMG GEOLOGIST: JACK WATSON (6/4/94); PHOTOS 2-9 AND 2-10; DRY NVI
Rank Table
Information
Investigator: J. WATSON
Date: 6/4/1994
Photos Available?:
Access:
Nearest Wetlands/Bog:
Drainage Basin: DEXTER GULCH
Water Contact Stream:
Nearest Surface Water Intake:
Number of Surface Water Intake(s) observed within 15 miles downstream:
Uses of Surface Water Intake(s) observed within 15 miles downstream:
Nearest Wells (miles):
Number of Wells within 4 miles:
Uses of Wells within 4 miles:
Nearest Dwelling (miles):
Number of Months Occupied:
Number of Houses within 2 miles:
Recreational Usage on Site:
Nearest Recreational Area (miles):
Name or Type of Recreational Area:
Safety Risk from Open Adit/Shaft:
Safety Risk from Highwall or Unstable Slopes:
Safety Risk from Unstable Structures:
Safety Risk from Chemicals:
Safety Risk from Solid Waste (includes sharp rusted items):
Safety Risk from Explosives:
Sensitive Environments within 2 miles of Site or 15 miles Downstream:
Population within 0-0.25 miles:
Population within 0.25-0.5 miles:
Population within 0.5-1 miles:
Population within 1-2 miles:
Population within 2-3 miles:
Population within 3-4 miles:
Public Interest:

End of report. Retrieved 4/28/2024 4:56:47 AM.

The preceding materials represent the contents of the databases at the Montana Bureau of Mines and Geology at the time and date of the retrieval. The information is considered unpublished and is subject to correction and review on a daily basis. The Bureau warrants the accurate transmission of the data to the original end user at the time and date of the retrieval. Retransmission of the data to other users is discouraged and the Bureau claims no responsibility if the material is retransmitted. There may be data in the request area that are not recorded at the Bureau.