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Orestimba Mine (Palo Alto Mine), Rooster Comb, Orestimba Mining District, Diablo Range, Stanislaus Co., California, USAi
Regional Level Types
Orestimba Mine (Palo Alto Mine)Mine
Rooster Comb- not defined -
Orestimba Mining DistrictMining District
Diablo RangeMountain Range
Stanislaus Co.County

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Latitude & Longitude (WGS84):
37° 17' 49'' North , 121° 19' 6'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
Diablo Grande826 (2017)11.7km
Crows Landing355 (2011)24.3km
Patterson21,498 (2017)25.6km
Newman10,899 (2017)26.4km
Gustine5,756 (2017)28.6km

A former Hg mine located in sec. 28, T7S, R6E, MDM, 6.9 km (4.3 miles) NNE of Rooster Comb, along the South Fork Orestimba Creek. Discovered before 1900. Owned by H. A. Wilder. Idle since WWI. MRDS database stated accuracy for this location is 100 meters.

Mineralizaion is hosted in Late Jurassic shale. Controls for ore emplacement included shear zones. Alteration is local (silicification of shale). Local rocks include rocks of the Franciscan melange.

Local structures include shears.

Workings include unspecified underground openings with an overall depth of 22.86 meters.

Production data are found in: U.S. Bureau of Mines file data (unspecified).

Production statistics: Year 1960: Period To: 1960. ^5-6 pounds/ton (2,485 grams/metric ton) Hg.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: HgS
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: MgCO3
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1

List of minerals for each chemical element

C MagnesiteMgCO3
O MagnesiteMgCO3
Mg MagnesiteMgCO3
S CinnabarHgS
Hg CinnabarHgS


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Fortsner, William (1908), Quicksilver Resources of California: California Division of Mines and Geology Bulletin 27, 270 p.
Laizure, Clyde McK (1925), San Francisco field division: California Journal of Mines and Geology, California Mining Bureau (Report 21): 21(3): 216.
Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Journal of Mines and Geology, California Division Mines (Report 35): 35: 472.
Charles, Abbott (1947), Mines and minerals of Stanislaus County: California Division Mines Report 43: 43(2) (April): 96-98.
Holmes, Jr., G.W. (1965), Mercury in California: in: U.S. Bureau of Mines Information Circular 8252.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040866 & 10287332.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060990063.
Bailey, E. H., USGS, personal files.

USGS MRDS Record:10040866
This page contains all mineral locality references listed on 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 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.
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