References
SKINNER, W., MINING INTERNATIONAL YEARBOOK, GOPENGCONSOLIDATED LTD: THE FINANCIAL TIMES, LONDON, 1978P. 271.STAFF, ENGINEERING AND MINING JOURNAL INTERNATIONAL DIRECT-ORY OF MINING AND MINERAL PROCESSING OPERATIONS, GOPENGCONSOLIDATED LTD., MCGRAW-HILL, NEW YORK, 1978, P. 310.MINING JOURNAL, A GOOD YEAR: MAY 10, 1974, P. 382.WILLBOURN, E.S., NOTES ON THE OCCURRENCES OF LODE TIN-ORE INTHE KINTA VALLEY: MALAY FEDERAL PUBLICATION, 1924, P. 2.INGHAM, F.T. AND BRADFORD, E.F., THE GEOLOGY AND MINERALRESOURCES OF THE KINTA VALLEY, PERAK: FEDERATION OFMALAYA GEOLOGICAL SURVEY, DISTRICT MEMOIR 9, 1960, P. 64,78-80, 248, 219, 242-245.NEWALL, R.A., CHARACTERISTICS OF THE STANNIFEROUS ALLUVIUMIN THE SOUTHERN KINTA VALLEY, WEST MALAYSIA: GEOLOGICALSOCIETY OF MALAYSIA, BULLETIN NO. 4, JUNE 1971, P. 15-37.MINING JOURNAL, PRICE THE KEY: MARCH 11, 1977, P. 186.ANNUAL REPORT, GOPENG CONSOLIDATED, LIMITED, 1976TIN INTERNATIONAL, GOPENG CONSOLIDATED: APRIL 1976, P. 121.PAKIANATHAN, S. AND SIMPSON P., GENERAL PRACTICES ON LARGE-SCALE HYDRAULIC MINES IN MALAYSIA: IN OPENCAST MINING,QUARRYING AND ALLUVIAL MINING, PROCEEDINGS OF A SYMPOSIUMORGANIZED BY THE INSTITUTION OF MINING AND METALLURGY, INCO-OPERATION WITH THE INSTITUTION OF MINING ENGINEERS ANDTHE INSTITUTE OF QUARRYING, HELD FROM 16TH TO 19TH NOVEM-BER 1964, AT CAXTON HALL, WESTMINSTER, LONDON, 1965, P.115-124.MINING JOURNAL, PRODUCTION DECLINES: MARCH 3, 1978, P. 164.SCRIVENOR, J.B., NOTES ON CASSITERITE IN THE MALAY PENIN-SULA: P. 118-120.MINING JOURNAL, PERAK DEVELOPMENTS: MAY 23, 1975, P. 405.MINING JOURNAL, JULY PRODUCTION: AUGUST 23, 1963, P. 180.