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

Sites Table
AIM Id Name Alternate Name District County
GR007828 PORT ROYAL PRINCETON GRANITE
MRDS AMLI MILS Latitude Longitude Datum
46.4094 -113.0953
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
08N 12W 34 BBAC
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
7400 F BUTTE PHILIPSBURG PIKES PEAK
Property Type Update Date Who Updated
LODE 5/2/1995 SAC
Agency Info Table
Information
Agency: NF
Region District: R1
Ranger District: PHILIPSBURG
Forest Service Tract:
Watershed Code:
Forest or Resource Area: DEERLODGE
Owner: P
Impact: L
Report: Port Royal The Port Royal was the largest producer in the Princeton district, with over $2 million in gold recovered from the 1890s until its closure in 1931 (unpublished information, MBMG files). Five drifts with a total length of 8000 feet follow a S65E 60SE vein along a normal fault in granodiorite of the Royal stock (Emmons and Calkins, 1913). The vein is from 4 inches to 2 feet wide and composed of quartz, pyrite, and galena, although vein pieces on the dump contain less than 1% sulfides. Biotite and feldspar in the granodiorite have been altered to calcite, sericite, and chlorite. The ore was richest on either side of a 100 foot wide granite porphyry dike which must be related to the mineralization. The vein contained from $8 to $200 per ton in gold values. A gravity mill was built at the mine in 1892 and the tailings were allowed to run down Royal Gold Creek. Although a few remnant of the original tailings remain just below the mine (the Port Royal Tailings), most ended up a mile downstream (Royal Gold tailings). Here a cyanide mill was built in 1905 to re-treat them (Emmons and Calkins, 1913). Today, all adits are caved except the lower one, which has a large volume discharge.
Assay Table
Information
Sample Id: JGPR
Material Type: MI
Sample Method: COMP
Comments: Port Royal mine.
Screening Criteria Table
Information
Mill Tailings: Y
Adit Discharge: Y
Metal Leaching: N
Water Erosion: N
Residence: N
Hazardous Materials: N
Open Adit: N
Visit: Y
Comments: LONN; 8/92; see also Sunday mine
Rank Table
Information
Investigator: J. LONN
Date: 8/1/1992
Photos Available?:
Access:
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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:
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Uses of Wells within 4 miles:
Nearest Dwelling (miles):
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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:
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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 5/3/2024 1:20:07 PM.

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