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Boyd-Smith Mine (Groome Mine; Lennig Mine; Smith Mine), Mineral, Gold-Pyrite Belt, Louisa Co., Virginia, USA

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Latitude & Longitude (WGS84): 38° 2' 46'' North , 77° 53' 32'' West
Latitude & Longitude (decimal): 38.0461111111, -77.8922222222


A volcanogenic massive sulphide deposit, thought to be of the Kuroko type, hosted by the Chopawamsic Formation. In the rather linear trend where the massive sulphides of the Mineral District occur the Chopawamsic is predominantly metamorphosed intermediate and felsic volcanics. The ore bodies are stratiform lenses, often dominantly pyritic, that contain variable amounts of sphalerite, galena and chalcopyrite. A variety of minor minerals occurs thinly scattered among the major ore minerals. Gangue minerals include quartz, silicates and magnetite. Sandhaus and Craig (1986) did not examine material from this mine during their investigation of gahnite associated with the ores. However, given its widespread distribution several nearby and very similar ore deposits its presence seems likely.

The massive sulphides of the Mineral District were mainly mined for pyrite to produce sulphur and sulphuric acid. Pyrite mining ended when cheaper, and more abundant sources of elemental sulphur were developed in the early 20th century. Copper, lead and, zinc were generally byproducts.

Like the other massive sulphide mines of the area the Armenius has been "reclaimed". Recent air photos suggest that the mineral-bearing dumps have been bulldozed, recontoured, heavily limed, covered and revegetated leaving little or nothing of mineralogical interest. In the case of the Boyd-Smith Mine, in addition to the usual measures, a dike appears to have been constructed between the site and Contrary Creek.

Mineral List


17 valid minerals.

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

Holocene
0 - 0.0117 Ma
quaternary alluvium

Age: Anthropocene (0 - 0.0117 Ma)

Description: Fine to coarse gravelly sand and sandy gravel, silt, and clay, light- to medium gray and yellowish gray; clasts consist mainly of vein quartz, quartzite, and other metamorphic rocks. Beds along the Potomac River and its tributaries south of the District of Columbia contain sparse brackish water clam shells as well as rare lenses of shells reworked from units as old as Paleocene. East of the Potomac River clasts of metamorphic rocks become much less abundant. Thickness typically 1 to 6.5 m (2 to 2- ft), but can be as much as 15 m (50 ft). North of the Hybla Valley in Virginia, as well as in Maryland and the District of Columbia, Qal includes Qm and Qsp. West of the Coastal Plain province, locally contains terrace deposits.

Comments: tan; thin,medium,thick; quartz; Dominant bedding; fluvial, modern creeks and rivers; sand and gravel

Lithology: Gravel

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [70]

Cambrian
485.4 - 541 Ma
Chopawamsic Formation

Age: Cambrian (485.4 - 541 Ma)

Stratigraphic Name: Chopawamsic Formation

Description: Consists of lenses and tongues of metavolcanic, metasedimentary rocks, amphibolite greenstone and dark schist (island-arc terrane)

Lithology: Metavolcanics

Reference: Davis, A.M., C.S. Southworth, J.E. Reddy, J.S. Schindler. Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg. U.S. Geological Survey Open-File Report 01-227. [69]

Cambrian
485.4 - 541 Ma
Chopawamsic Formation - Interlayered felsic and mafic metavolcanic rocks

Age: Cambrian (485.4 - 541 Ma)

Stratigraphic Name: Chopawamsic Formation

Description: Chopawamsic Formation, undivided, (Pavlides, 1981). Includes laterally discontinuous lenses and tongues of metamorphosed felsic, intermediate, and mafic volcanic flows and volcanoclastic rocks, with interlayered quartzite, quartzose graywacke, schist, and phyllite. Volcanic flows are locally highly vesicular; fragmental breccia and tuff are common. Felsic flows are typically light-gray aphanitic rocks with phenocrysts of quartz and feldspar; intermediate flows are dark-green amphibole-bearing rocks with fine-grained quartz-feldspar matrix; greenstone metabasalts contain blue green amphibole, chlorite, albitic plagioclase, and quartz. Geophysical signature: linear strike-elongate pattern of elevated magnetic anomalies. The Chopawamsic is correlated with the James Run Formation in Maryland; the James Run has been dated at 570 to 530 Ma (U-Pb zircon; Tilton and others 1970). The Chopawamsic is unconformably overlain by the Late Ordovician Arvonia and Quantico Formations. Pavlides (1981 and subsequent works) has made the interpretation on the basis of geologic and geochemical data that the Chopawamsic and related plutons represent an ancient is land-arc sequence.

Comments: Central Virginia Volcanic-Plutonic Belt

Lithology: Major:{metavolcanic}

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]

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

GAIR, J E (ED), 1978, MASSIVE SULFIDES OF VIRGINIA FIELD TRIP GUIDEBOOK: INTERNATIONAL GEOLOGICAL CORRELATION PROGRAM, PROJECT NO 60, 112 P

HICKMAN, R C, 1947, PYRITES, MINERAL, LOUISA COUNTY, VA: US BUREAU OF MINES REPORT OF INVES

SANDHAUS., D.J . & CRAIG, J .R. (1986): GAHNITE IN THE METAMORPHOSED STRATIFORM MASSIVE SULFIDE DEPOSITS OF THE
MINERAL DISTRICT, VIRGINIA, U,S.A. TSCHERMAKS MIN.
PETR MITT.35,77-98.

 
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