Zwartkop Intermediate Seam

JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METAL-LURGY, 1968, CHROMIUM IN SOUTH AFRICA, V68."MINERAL RESOURCES OF THE UNION OF SOUTH AFRICA", 1959,CHROMIUM: GEOLOGICAL SURVEY OF SOUTH AFRICA, 4TH ED.P. 187-200.RANKIN G, 1975, "CHROMIUM AND FERROCHROMIUM IN SOUTHAFRICA.", SAUNDERS AND TAYLORINC., INVESTMENT INDUSTRYREPORT, JOHANNESBURG, SOUTH AFRICA, P. 1-117.METAL BULLITIN, 1969, "UNION CORPORATION'S ZWARTKOP", DEC 161969, P. 25-28.COAL, GOLD AND BASE METALS, 1975, "LONGHOLING HITS GOLD ATZWARTKOP", V 23, NO. 6, P. 15-21.DE WET J F, 1952, "CHROMITE INVESTIGATIONS-PART IV", JOURNALOF THE CHEMICAL, METALLURGICAL & MINING SOC. OF S. AFRICA,V. 53, NO. 1, P. 1-10.WASSERSTEIN B, 1936, "CRITICAL ZONE OF THE BUSHVELD GABBROTRANS. OF THE GEOL. SOC. OF S. AFRICA, PAPER READ 23 JUNE1936.SIEMS P, 1976, "CHROMITE MINES AND RESOURCE OF THE UNION OFSOUTH AFRICA". MINERALS AVAIL. SYSTEM DEC. 1976, P. 21-23INDUSTRIAL MINERALS, 1970, "THE ZWARTKOP MINE OF CHROME OFSOUTH AFRICA", FEB. 1970.SILK M H, 1988, "WORLD CHROMITE RESOURCE AND FERROCHROMEPRODUCTION", MINTEK SPECIAL PUBL. NO. 11.DAVIDOFF R L, BOYLE E H JR., "NOTES FROM VISIT TO THE RE-PUBLIC OF SOUTH AFRICA", USBM PUBL. 1988.GOLDER AND ASSOC., 1981, "DEPOSIT PROFILE- ZWARTKOP, S.A."