A graphite occurrence/mine located 9 miles NW of Burnet on private land (fee ownership). Discovered and first produced in 1913. Owned by the Southwestern Graphite Company, a division of the Joseph Dixon Crucible Company, Jersey City, New Jersey (100%) (1983). The USGS MRDS database stated accuracy for this locality is 10 meters.

The Southwestern Graphite Mine consists of 3 separate ore bodies lying along a stratum of graphite schist. For purposes of evaluation, these ore bodies are treated as a single reserve. The ore body grades are similar enough; however, so that no changes in concentrate grade would be anticipated as a result of mining a different ore body. Information on the property is sketchy. The parent company (Dixon) refused to release any data on the property for reasons of company policy. Most of the data used were from 2 U.S. Bureau of Mines studies of the mine done in 1976.

A graphite deposit hosted in schist. The ore body strikes N65E and dips 80N at a thickness of 46 meters, a width of 50 meters and a length of 1,000 meters and with a depth-to-top of 0 meters, covering an area of 30.4 HA. Ore body No. 1 is disseminated & tabular. The primary mode of origin was sedimentation and the secondary mode of origin was metamorphism. Primary ore control was lithology. Wallrock alteration is intense (other). The thickness of the mineralization reflects the depth of mineralization to about 50 feet below the level of Clear Creek. The extent of mineralization at depth is not known. The dimensions given encompass all three ore bodies as well as the less mineralized rock between them. Local rocks include the Packsaddle Schist.

Regional geologic structures include the Llano uplift.

Workings include surface openings comprised of open pits.

Production was 36,641 metric tons of graphite (1961-1979).

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Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Graphite

Mineral List

ⓘ 'Garnet Group'

ⓘ Graphite

ⓘ Pyrite

2 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ Schist

Detailed Mineral List:

ⓘ 'Garnet Group'

Formula: X₃Z₂(SiO₄)₃

References:

Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622

ⓘ Graphite

Formula: C

References:

Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622

ⓘ Pyrite

Formula: FeS₂

References:

Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Graphite	1.CB.05a	C
Group 2 - Sulphides and Sulfosalts
ⓘ	Pyrite	2.EB.05a	FeS₂
Unclassified
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃

List of minerals for each chemical element

C	Carbon
C	ⓘ Graphite	C
O	Oxygen
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	Silicon
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
S	Sulfur
S	ⓘ Pyrite	FeS₂
Fe	Iron
Fe	ⓘ Pyrite	FeS₂

Other Databases

Link to USGS MRDS:	10178636

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Granite-Rhyolite ProvinceMagmatic Province
Shawnee DomainDomain

USA

Texas
- Burnet-Llano Mining DistrictMining District

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

Du Laus, Proprietary Report Prepared for U.S. Bureau of Mines under contract No. J0225019, 12 pages.

U.S. Bureau of Mines, Proprietary, Microfilm Production Records, 1960-1977.

USGS MRDS ID #ISM0069.

Barnes, Virgil E. (1940), Additional Notes on Graphite in Texas. University of texas, Bureau of Economic Geology, Mineral Resources Circular No. 15, 9 pages.

Needham, A.B. (1946), Mining and Milling Operations of the Southwestern Graphite Company, Burnet County, Texas. U.S. Bureau of Mines Information Circular IC 7339, 9 pages.

Tyler, P.M. (1953), Report on Natural Graphite. Minerals and Metals Advisory Board Report No. MMAB-44-M-C, 41 pages.

USGS (1954), Llano, Texas, 1° by 2° Topographic map, scale 1:250,000.

Cameron, E.N. and Weis, P.L. (1960), Strategic Graphite - A Survey, in Contributions to Economic Geology 1958, USGS Bulletin 1082-E: 201-321.

USGS (1967), Council Creek, Texas, quadrangle 7 1/2 minute topo map, scale 1:24,000.

Graffin, G.D. (1975), Graphite: Chapter in Industrial Minerals and Rocks, S.J. Lefond, editor: 691-705.

U.S. Bureau of Mines (1976), Preliminary Feasibility Estimates of Proposed Alabama and Canadian Crystalline Graphite Projects Related to the U.S. Market. U.S. Bureau of Mines Proprietary Report prepared by Minerals Availability System: 11-16, 23-25.

U.S. Bureau of Mines (1976), Summary Report of Cursory Feasibility Estimates of Hypothetical Graphite Mine and Mill Operations in Alabama, Texas, Canada and Alaska. U.S. Bureau of Mines Availability System: 4-5, 8-10.

Zellars-Williams, Incorporated (1983), Profile Report, Notre Dame.

Rocks & Minerals (1991): 66:3: 196-224.

U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0480530004.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

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Southwestern Graphite Mine, Burnet County, Texas, USAiRegional Level TypesSouthwestern Graphite MineMine Burnet CountyCounty TexasState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Commodity List

Mineral List

Rock Types Recorded

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Databases

Other Regions, Features and Areas containing this locality

References

Southwestern Graphite Mine, Burnet County, Texas, USA i
Regional Level Types
Southwestern Graphite Mine Mine
Burnet County County
Texas State
USA Country