Mazza prospect (Mazza Ranch prospect), Novato, Marin County, California, USAi
| Regional Level Types | |
|---|---|
| Mazza prospect (Mazza Ranch prospect) | Prospect |
| Novato | City |
| Marin County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 9' 47'' North , 122° 38' 17'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Petaluma | 60,438 (2017) | 7.7km |
| Novato | 55,530 (2017) | 8.6km |
| Black Point-Green Point | 1,306 (2011) | 12.1km |
| Lucas Valley-Marinwood | 6,094 (2011) | 14.7km |
| Penngrove | 2,522 (2011) | 15.4km |
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 |
|---|---|---|
| Santa Rosa Mineral And Gem Society, Inc. | Santa Rosa, California | 32km |
| Vallejo Gem & Mineral Society | Vallejo, California | 34km |
| San Francisco Gem and Mineral Society, Inc. | San Francisco, California | 47km |
A Mn-Hg-Ni(?) occurrence/prospect located in the SW¼ sec. 28, T4N, R7W, MDM, 8.7 km (5.4 miles) NW of Novato (6.5 miles S of Petaluma; 2.5 miles SE of Union School). Discovered in 1915 or 1918. Owned by R. Mazza (1974)/operated by Francis A. Mazza. MRDS database stated accuracy for this location is 1,000 meters. Developed by M. Vonsen during WWI but no shipments were made. The pit is idle and is nearly filled with material bulldozed from a nearby trail.
The ore body strikes N25E and dips 60SE at 15 feet thick. It lies parallel to enclosing chert. The hanging wall is soft brown, iron-stained chert and the footwall is covered by alluvium. It is gray and pink carbonate with a progressive silica content toward the footwall. Quartz veins cut the ore and masses of pyrite and specks of cinnabar are present. A small amount of oxide is found along the hanging wall. The proportion of silica is so high that the production of Mn ore seems unlikely. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains).
Workings include surface openings comprised of a pit about 30 feet in diameter.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
4 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Cinnabar Formula: HgS |
| ⓘ 'Manganese Oxides' |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodochrosite Formula: MnCO3 Colour: Gray, pink |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Unclassified | |||
| ⓘ | 'Manganese Oxides' | - | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Pyrite | FeS2 |
| Mn | Manganese | |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS MRDS: | 10030799 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
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