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McKinnan Gulch prospect, Bolinas Ridge, Stinson Beach, Marin Co., California, USA

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Latitude & Longitude (WGS84): 37° 55' 47'' North , 122° 38' 39'' West
Latitude & Longitude (decimal): 37.93000,-122.64417
Köppen climate type:Csb : Warm-summer Mediterranean climate


A Cu-Pb prospect located in the4 S½S½ sec. 21, T1N, R7W, MDM, on Bolinas Ridge, 100 yards W of Bolinas Ridge Road at the head of McKinnan Gulch, 3.3 km (2.1 miles) N of Stinson Beach. MRDS database stated accuracy for this location is 100 meters. Probably prospected in the 1930's.

Mineralization is hosted in shale. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).

Workings include surface and underground openings comprised of an open cut and tunnel (the topo map reflects only 1 shaft symbol identified as this mine).


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


4 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cretaceous - Jurassic
66 - 201.3 Ma



ID: 2991649
Franciscan melange

Age: Mesozoic (66 - 201.3 Ma)

Stratigraphic Name: Franciscan Complex

Description: Melange of fragmented and sheared Franciscan complex rocks.

Comments: Coast Ranges. Includes areas of Franciscan rocks specifically distinguished as melange on the Geologic Map of California. Includes parts of central and eastern Franciscan belts of Blake et al. (1988)

Lithology: Major:{melange}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Jurassic
145 - 201.3 Ma



ID: 2709638
Franciscan Complex

Age: Jurassic (145 - 201.3 Ma)

Stratigraphic Name: Franciscan Complex

Description: Greenstone: Consists of pillow lava and less abundant tuff, breccia, and intrusive basalt, diabase, and rare gabbro. Local lenses of thin-bedded radiolarian chert are as thick as 30 m. Fresh rock is hard, relatively unsheared, and ranges from essentially structureless to strongly pillowed; deeply weathered in places; crops out in elongate masses as long as 14 km, which, with one exception, are aligned in a northwest-trending band 5 kilometers east of the San Andreas Fault Zone

Reference: Blake, M.C. Jr., R.W. Graymer, and D.L. Jones. Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma Counties, California. U.S. Geological Survey Miscellaneous Field Studies MF 2337. [38]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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

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Ver Planck, Wm. E., Jr. (1955), Mines, mineral resources and mineral industries of Marin County, California: California Journal of Mines and Geology, California Division of Mines (Report 51): 51(3): 267, 279. NOTE: Reference plate number truncated by MRDS database.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030794 & 10163677.
U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060410026.

Mineral and/or Locality  
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