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

Sites Table
AIM Id Name Alternate Name District County
CC002885 BIG SEVEN MONTANA/NEIHART CASCADE
MRDS AMLI MILS Latitude Longitude Datum
W014726 07-156 300130038 46.9486 -110.7042
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
14N 08E 28 ADAA 5199277 522513 12
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
F WHITE SULPHUR WHITE SULPHUR NEIHART
Property Type Update Date Who Updated
LODE 5/21/1998 JDL
Commodities Table
Commodities Identified
GOLD
LEAD
SILVER
ZINC
Agency Info Table
Information
Agency: NF
Region District: R1
Ranger District: KINGS HILL
Forest Service Tract:
Watershed Code: 10030105
Forest or Resource Area: LEWIS AND CLARK
Owner: P
Impact: L
Report: The Big Seven site is located about 2 miles northeast of Neihart (Robertson, 1951). This was a gold, silver, lead, and zic mine. The mill tailings were impounded in a pond and two piles. The volume of the tailing s was estimated to be 2,580 cubic yards. The volume of the waste rock was estimated to be 25,800 cubic yards. Sediments released were mercury and manganese and there was zinc and manganese in the water. Cadmium levels exceeded the drinking water standards. One adit was discharging at a significant flow and had iron staining 1,000 feet downstream. The water had a pH of 6.63 and exceeded drinking water standards for cadmium and nickel. There were several building that were in fair condition, and there were two open adits. Robertson states that the Big Seven mine was developed by four main adits, the three upper adits were driven along the vein and the lower adit was driven a s a crosscut. The lower adit was about 800 feet long and then it was driven as a drift for about 2,900 feet. This vein is about seven feet wide and is nearly vertical. The ore minerals in the uppers parts of the mine were silver sulfides and the lower parts were mainly lead and zinc. There were two ore shoots that were about 600 feet long.
Sample Table
Sample Id Sampler pH SC Date TempC Flow Rate Flow Units Flow Method Source Ind No Veg Stain Salt Sulf Turb Location Related to Stream Stream Sedimention Photos Available? Photo Numbers Remarks
BSNS10L PAH 7.1 46.8 5/27/1998 5.3 2.1 CFS METER STREAM UP SNOW CREEK Y 60-1
BSNS20M PAH 7.09 150.5 5/27/1998 7.1 5.6 CFS METER STREAM DOWN SNOW CREEK Y 60-2
Screening Criteria Table
Information
Mill Tailings: Y
Adit Discharge: Y
Metal Leaching: Y
Water Erosion: Y
Residence:
Hazardous Materials:
Open Adit: Y
Visit: Y
Comments: JEFF LONN; 5/17/98; ALSO DSL-AMRB/PIONEER TECHNICAL SERVICES REPORT (1995).
Rank Table
Information
Investigator: J. LONN
Date: 5/17/1998
Photos Available?:
Access:
Nearest Wetlands/Bog:
Drainage Basin:
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 5/2/2024 1:41:07 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.