Franklin Mine (Franklin vein; Franklin and Milkmaid Mine; Milkmaid Mine), French Gulch, French Gulch Mining District, Klamath Mountains, Shasta County, California, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
40° 43' 21'' North , 122° 40' 9'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| French Gulch | 346 (2011) | 3.6km |
| Lewiston | 1,193 (2011) | 11.8km |
| Shasta | 1,771 (2011) | 20.3km |
| Keswick | 451 (2011) | 20.4km |
| Weaverville | 3,600 (2011) | 23.0km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Shasta Gem & Mineral Society | Redding, California | 28km |
Mindat Locality ID:
92608
Long-form identifier:
mindat:1:2:92608:4
GUID (UUID V4):
156b6802-dbdb-421f-a725-c002f4361b65
Former lode Au-Pb-Zn mines (subsequently consolidated) located in secs. 16 & 17, T33N, R7W, MDM, 3.6 km (2.2 miles) NW of French Gulch, along Right Fork French Creek between the creek and Yankee Billy Ridge. MRDS database stated accuracy for this location is 500 meters.
Mineralization is a gold-bearing vein deposit (Deposit model: Model code 273
USGS model code 36a; Low-sulfide Au-quartz vein; Mark3 model number 27), hosted in the Bragdon Formation (granite, diorite, porphyry, slate, shale, siltstone). The ore body is lenticular, strikes N10W, dips 80E, and has a thickness of 1.22 meters. Controls for ore emplacement included a shear zone and fractures. There are 2 ore veins. One strikes N5-30W, dipping steeply E; while the other strikes E-W, dipping about 70N. A few hundred feet N of the Franklin Mine, slate overlies greenstone; diorite and granitic dikes occur to the S and a granitic dike exists at depth on the footwall. The ore vein varies from 12 inches to 4 feet. Minerals present include glassy quartz with vugs and secondary minerals up to 2 centimeters. Calcite is also present. Both diorite and granitic porphyries intrude into slate. Diorite porphyry is aphanitic, dark gray-green, with fine feldspar phenocrysts, thickly scattered. The ore shoots are irregular and pitch steeply S. The best ore was from veins in granitic porphyry close to slate contacts. Local rocks include carboniferous marine rocks, unit 4 (Eastern Klamath Mountains).
Workings include underground openings. On the Milkmaid property there are three levels with 1 crosscut adit at 100 feet long, 900 feet of drifts and a 200 foot shaft. On the Franklin property there are 2 adit levels, a 130 foot raise on the vein which connects the upper 2 adits, and drifts on all levels. The upper workings are in slate, the lower are in granitic porphyry.
Production data are found in: Logan, C.A. (1926).
This is one of the oldest lode Au producers in slate. More than half of the production was prior to 1907. Figures include production from both workings.
Analytical data results: Sulphide ore 0.75% of ore weight. Au @ $150 per ton (period values), associated with the sulphides. $20 to $45 per ton from the main vein (period values).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Calcite Formula: CaCO3 |
| β Galena Formula: PbS |
| β Gold Formula: Au |
| β Pyrite Formula: FeS2 |
| β Quartz Formula: SiO2 |
| β Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| β | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| β | Sphalerite | 2.CB.05a | ZnS |
| β | Galena | 2.CD.10 | PbS |
| β | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| β | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| β | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | β Calcite | CaCO3 |
| O | Oxygen | |
| O | β Calcite | CaCO3 |
| O | β Quartz | SiO2 |
| Si | Silicon | |
| Si | β Quartz | SiO2 |
| S | Sulfur | |
| S | β Galena | PbS |
| S | β Pyrite | FeS2 |
| S | β Sphalerite | ZnS |
| Ca | Calcium | |
| Ca | β Calcite | CaCO3 |
| Fe | Iron | |
| Fe | β Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | β Sphalerite | ZnS |
| Au | Gold | |
| Au | β Gold | Au |
| Pb | Lead | |
| Pb | β Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10077607 |
|---|
Other Regions, Features and Areas containing this locality
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060890413
