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Gold/Mining/Energy : ORXX - Orex Gold Mines Corporation -- Ignore unavailable to you. Want to Upgrade?

To: Aj-Ruk who wrote (171)	8/4/1999 5:56:00 PM
From: Ga Bard	Read Replies (1) \| Respond to of 2392

REPORT OF LIXIVIANT STUDIES ON FLOTATION-CONCENTRATE Prepared for: * PRECIOUS METALS REFINING CORPORATION 470 Main Road Towaco, NJ 07082 Prepared by: Lyntek, Incorporated 775 Mariposa Street Denver, Colorado 80204 APRIL, 1996 TABLE OF CONTENTS 1.0 Executive Summary 2.0 Summary 3.0 Process Flowsheet 3.1 Roasted Concentrate Processing with HG? Reagent Suite 3.2 Roasted Concentrate Processing with Cyanide 4.0 Capital Cost 4.1 Roasted Concentrate Processing with EP Reagent Suite 4.2 Roasted Concentrate Processing with Cyanide 5.0 Operating Cost 5.1 Roasted Concentrate Processing with HOP-Reagent Suite 5E2 Roasted Concentrate Processing with Cyanide 6.0 Environmental Considerations Appendix A Flowsheet Drawings Appendix B RDI Report of Testwork 1 EXECUTIVE SUMNIARY Lynrek has been commissioned to do a series of metallurgical tests to determine the actual recovery information of a new lixiviant extracting gold from two different feed materials. Lyntek had arranged for a sample of Golden Wonder concentrate to be shipped t6Lyntek for testing. Preciouls Metals Refining Corporation (PMRC) arranged for the sample of RAC ore to be shipped from Nevada to Colorado for further testing. A representative of PMRC witnessed beneficial testing during the months of October and November 1995. The testwork was conducted at Mineral Research and Development, Inc. (MRDI) Golden, Colorado. This report provides a written record of the observation of the bench scale tests performed on the Golden Wonder Concentrate7 a discussion of the test results, and compares capital and operating costs for hypothetical plant installations utilizing the HOP reagent suite and conventional cyanidation. A companion report discusses the results from testing the FMC head ore. Lyntek has been involved with Precious Metal Refining Corporation and/or their historical fathers for the last five years investigating the new lixiviant for gold leaching Lyntek has found increased gold recoveries in a shorter period of time when comparing the new lixiviant Venus cyanide leaching. reagent costs were much lower with the HOP reagents versus the cost of conventional cyanidation. The costs with the cyanide system were an order of magnitude greater than those with the HGP system. The testwork also investigated whether or not conventional gold capturing means can be used in order to recover the gold from solution. Both Merrill-Crowe and carbon were investigated and it was determined that both systems could be used in order to gather the gold from the leached ore. The ores responded much faster under the new lixiviant system compared to conventional cyanidation. The Golden Wonder concentrate had to be roasted which would indicate that the new lixiviant does not have oxidizing powers that would make refractory ores non-refractory. This new lixiviant system will work extremely well on gold bearing ores which are microfine and liberated, or which are microfine and encapsulated in silicate. This system does not tend to work in ores that are heavily carbonaceous, refractory or pyrite encapsulated One of the major drawbacks of this system is die non-recovery of any of the silver metals. No silver credit can be given on a whole ore. TABLE 5.3 PRECIOUS METALS REFINING CORP 2 FLOTATION CONCENTRATE - CYANIDE METHOD OPERATING COSTS TONNAGE FACTOR FT3/ton GOLD PRICE $400.00 SILVER PRICE 35.00 CONCENTRATE AVAILABLE (GRADE) TONS 3,750 … GOLD(AU) 35.000 TFD 360 DAYS PER YEAR / 5 YEAR LIFE PR0CESSING PLAN GOLD TOTAL OUNCES 306,250 BASED UPON THE PRELIMINARY REPORT & TOTAL CURRENT RESERVE POTENTIAL TOTAL RESERVES GOLD 306.260 SILVER 0 COST OF PROCESSING - CONCENTRATE CYANIDE METHOD USEAGE COST CHEMICALS …………….. $/TON …. Usage LBS/TON …… COST $/TON CYANIDE ………………… $1.00 ………… 52.8 ……………. $52.80 CARBON …………………. $1.00 ………… 1 ……………….. $1.00 NEuTIIALIZATIOE ………. $2.00 …………. 1 ………………. $2.00 CAUSTIC ………………… $0.40 …………. 25 ………………. $10.00 CYANIDE ………………….$0.90 …………. LG ……………… $2.25 LIME ……………………….$0.06 ………….. 115 ……………. $6.90 MISC CHEM …………….. $2.00 …………… 1 ……………... $2.00 TOTAL CHEMICALS …………………………………………… $76.95 LAROR NO REO WHR HRSIYR. % FRINGE $/yr PROJECT MANAGER 1 35 2080 30%$94,640 METALLURGICAL ENGR 1 an Rosa$77,376 PLANT LEAD OPERATOR 4 12 2050 24%$123,502 LEACH PERSONNEE 4 10 2060 24%$103,155 RECOVERY ANDREFINERY 2 ID 2080 24%$51.584 PLANT MECHANIC 1 12 2050 24%$30,950 CHEMIST 1 18 2060 24%$45,426 SAMPLEANALYST 1 9 2080 24%$23,213 SECRETARY 1 S 2060 24%$20,634 NO.OF PEOPLE 16 TOTAL LABOR $571,782 COSTOF OPERATION S/TON CHEMICALS $76.95 LASOR $163.37 MISC. COST $25.00 CONTINGENCY $53.08 TOTAL COST/TON $318.32 COST PER OUNCE $9.10 VS Cost per ounce $7.95 of table 5.2 for HGP