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

Sites Table
AIM Id Name Alternate Name District County
BE000497 SYLVIA MINE ARGENTA BEAVERHEAD
MRDS AMLI MILS Latitude Longitude Datum
01-026 300010167 45.3047 -112.8908
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
06S 11W 13 DCDD 5018323 351761 12
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
6944 F NF DILLON DILLON ERMONT
Property Type Update Date Who Updated
LODE 4/6/1995 JEW
Commodities Table
Commodities Identified
GOLD
LEAD
SILVER
Agency Info Table
Information
Agency: NF
Region District: R1
Ranger District: DILLON
Forest Service Tract:
Watershed Code: 10020002
Forest or Resource Area: BEAVERHEAD
Owner: N
Impact:
Report: (BE000497) The Sylvia workings consist of at least 8 open shafts (mostly fenced), 2 caved adits, multiple dumps, and several trenches. Surface are disturbance is approximately 2 acres. Host rock is flat-lying Cambrian Flathead Quartzite. Workings explore a fissure vein 4" to 14" wide; the vein strikes N5E and dips 80NW. The gangue consisted of yellowish tan jasper containing small inclusions of vitreous quartz, earthly limonite, and plumbojarosite (Geach, 1972). Oxidized ore (lead, silver, and some gold) was stoped from the 90' level to surface; sulfides (primarily galena) were encountered below 90' (Geach, 1972). Dump rock exhibits heavy iron-oxide staining and contains substantial amounts of hematite and limonite; trace amounts of elemental sulfur were also noted. An AIM sample assayed greater than 10,000 ppm lead, 382 ppm zinc, 156 ppm copper, 68 ppm silver, trace gold, and 1875 ppm arsenic. Production from this mine was recorded in 1937, 1941-1943, 1948-1950, 1954, and 1963-1964 (Geach, 1972); some work was also done post-1964 (MBMG files). Cumulative production through 1964 was 545 tons yielding 229,047 pounds lead, 5,393 pounds zinc, 584 pounds copper, 16,757 ounces silver, and 516 ounces gold (Geach, 1972). This site is located on a dry N-S trending ridge; there is no water component. All workings are on USFS land.
Assay Table
Information
Sample Id: WRSA-1
Material Type: WA
Sample Method: COMP
Comments: MAIN DUMP
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 (6/6/94); PHOTOS 3-9 AND 3-10
Rank Table
Information
Investigator: J. WATSON
Date: 6/6/1994
Photos Available?:
Access:
Nearest Wetlands/Bog:
Drainage Basin: STAPLETON 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 4/27/2024 12:40:27 PM.

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.