Mine detail: Black Rock Mine

Previously called 'Devon & Adams Mine'

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Location

Lat / long:

-29.04763, 25.221

Resource(M)

Primary:	Manganese
Secondary:	Iron
Ore:	Bixbyite
Gangue:	Clay
Orebody form:	TABULAR/BLANKET
Discovery year:	1941

Production

Operation type:	Unknown
Production size:	Large
Development status:	Producer
First production started:	1955

Geology

Host type:	Volcanic Rock (Aphanitic)
Associated type:	Volcanic Rock (Aphanitic)
Structure:	Low Intensity Anticlines And Synclines Regionally. Faulting Intermittent And Of Limited Magnitude., The Ore-Bearing Structure Is A North-Trending Asymmetrical Anticline Planed Off By Erosion. Dips Are Moderately Variable On The Western Limb ( 20 - 25 Degrees West ) And Broken By Faulting, And Erratic, On The Eastern Limb.
Tectonic:	Platform; Possibly Several Tectonic Cycles

References

MRDS	W028269
DEP	10079221
Reference	{Deposit:: MINERAL RESOURCES OF THE REPUBLIC OF SOUTH AFRICA, FIFTH EDITION, HANDBOOK 7 , DEPARTMENT OF MINES, GEOLOGICAL SURVEY; 1976}{Deposit:: MINERAL RESOURCES OF SOUTH-CENTRAL AFRICA; PELLETIER, R. A.; 1964}{Deposit:: THE MANGANESE DEPOSITS OF THE UNION OF SOUTH AFRICA, HANDBOOK 2 , DEPARTMENT OF MINES, GEOLOGICAL SURVEY; 1960}{Production:: ANNUAL RPTS OF ASSOC MANGANESE MINES OF SOUTH AFRICA LTD. ; ASSOCIATED MANGANESE COMPANY OFFICIALS ; ASSOCIATED MANGANESE MINES ANNUAL REPORT - 1981}
Reporter	Sweetwood, Charles W., Mccarter, Lorna D, Mccarter, Lorna D.