Long Tom Mine (Knothe Mine; Roberts Gold Mine; Roberts Silver Mine), Kielberg Peak area, Rattlesnake Mining District, Graham County, Arizona, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
32° 34' 35'' North , 110° 20' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| San Manuel | 3,551 (2011) | 27.7km |
| Mammoth | 1,487 (2017) | 32.8km |
| Oracle | 3,686 (2011) | 40.8km |
| Tanque Verde | 16,901 (2011) | 52.1km |
| Dudleyville | 959 (2011) | 60.2km |
A former surface and underground Au-Ag mine located on 3 unpatented claims (1965), in sec. 7, T10S, R20E, 1 mile South of the Powers Mine and 6.5 miles E of the Pinal-Graham County line on land of mixed status. Owned and operated by E. Knothe, R.C. Roberts (1934).
Mineralization is a tabular ore body 0.91 meters wide, hosted in rhyolite. The rhyolite is intruded by dikes of andesite porphyry. The deposit occurs within a silicified, brecciated zone, up to about 3 feet (1 meter) wide that strikes SE-ward and dips steeply NE-ward. Richest portion generally less than 1 foot wide and occurs near the hanging wall. An associated rock unit is andesite.
Workings include several open cuts, a 40 foot (12.19 meters) deep shaft with a drift 30 feet N and a stub 20 feet long to the south from the bottom of the shaft. Production years of record: 1923-1928, 1933-1935.
The ore consists of silicified, brecciated rhyolite, cemented & partly replaced by sugary, grayish-white quartz and traversed by irregular veinlets of finely crystalline white quartz.
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Milky Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Milky Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Quartz var. Milky Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Quartz var. Milky Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS MRDS: | 10027018 |
|---|
Other Regions, Features and Areas containing this locality
Mexico
- Sierra Madre OccidentalMountain Range
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
- Southern Basin and RangeWide Rift
USA
- Arizona
- Galiuro MountainsMountain Range
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.
