List of Abstracts:
Due Diligence Technical Study of a Silver Processing and Refining Facility
Feasibility Study of a Copper Electrorefining Facility
Diagnostic Leach Testing of Industrially Processed Gold Ore
A Preliminary Scoping Study of Mineral Processing Alternatives for PGM Containing Fire Brick
Pilot Scale Silver Electrowinning Optimization Testing
Hydrometallurgical Technical Assistance for a Zinc Oxide Ore Body
Hydrometallurgical Testing and Engineering Expertise for A Philippine Nickel/Cobalt Laterite Ore
JK-SimMettm Short Course
Provision of Mineral Processing and Hydrometallurgical Technical Expertise in Support of a Pre-feasibility Level Study on a Complex Copper, Cobalt and Gold Mine
Due Diligence Technical Study of a Silver
Processing and Refining Facility
CAMP CLIENT PROJECT
Feasibility Study of a Copper Electrorefining Facility
A preliminary engineering study of a proposed copper electrorefining facility has been carried out at CAMP. This study included a +/- 30% fixed capital installed cost estimate, a +/- 30% operating cost estimate, a preliminary equipment list, a preliminary list of electrolytic equipment suppliers, a preliminary process flow diagram and a preliminary equipment layout. After this initial evaluation, the detailed engineering on the proposed facility can be performed.
CAMP CLIENT PROJECT
Diagnostic Leach Testing of Industrially
Processed Gold Ore
Diagnostic leach testing has shown that the significant refractory difference between a high recovery ore sample and a low recovery ore sample is encapsulation of gold by a sulfide mineral. The sulfide phase is most likely pyrite, the predominant sulfide mineral phase indicated by x-ray diffraction analysis. This conclusion is drawn from the large increase in gold cyanidation recovery after low recovery ore pretreatment with nitric acid (i.e. highly oxidizing conditions). Moreover, the tails ore sample diagnostic leach test results support this inference. A secondary influence on refractoriness may be due to silica encapsulation of gold. There is a comparatively large estimated fraction of gold associated with silicates in the low recovery ore. This is not to discount the role that tellurides may play in refractoriness. Tellerium gold minerals can also be destroyed by use of highly oxidizing pretreatments (i.e. chlorination, oxidative roasting). Further testing should be done with bench scale acidic oxygen pressure leaching pre-treatment on the low gold recovery ore. From this testing, the magnitude of telluride refractoriness versus sulfide refractoriness can be better determined. Moreover, this testing would further prove the applicability of the technology to the ore. And, order of magnitude capital and operating cost estimations could be formulated from the testwork for possible implementation of this proven industrial process into the existing industrial operation. Finally, if the gold particle size is not excessively small, finer grinding of the ore may assist in improving gold recovery to some degree. This also could be determined with further testwork.
CAMP CLIENT PROJECT
A Preliminary Scoping Study of Mineral Processing
Alternatives for PGM Containing Fire Brick
At last report, the client had accumulated 77.4 tons of Electric Furnace firebrick ‘tear out’ material and 14.7 tons of TBRC firebrick ‘tear out’ material. As these materials contain considerable amounts of PGM’s, they are normally recycled to the client’s flotation plant. Initially, confirmatory laboratory flotation testing using standard client procedures was to be performed at CAMP. However, a scoping study of other mineral processing based alternatives was also included at CAMP at the request of client.
Based on the scoping testwork done on the client’s firebrick ‘tear-out’ materials, it appears that gravity separation of some type may provide a more direct means of recovering and concentrating PGM values. In particular, for the Electric Furnace materials a size/hardness recovery step coupled with gravity concentration may provide improved PGM recovery results. More testing should be done to verify and optimize these process options. This suggestion is magnified in light of the nominal PGM recovery results realized from flotation testing of materials by CAMP using standard and modified client procedures. If these flotation tests are truly reflective of the plant performance at any time or with a given recycle feedstock, more work should be done to define this process and optimize it so PGM losses to tails are minimized. Lastly, the use of magnetic or electrostatic separation, based on the scoping type testwork performed at CAMP, does not appear promising and should not be pursued further at this time.
CAMP CLIENT PROJECT
Pilot Scale Silver Electrowinning Optimization Testing
Pilot scale silver electrowinning optimization testing was performed by CAMP in support of a bankable feasibility study for a proposed major silver mine in eastern Russia. The variables studied included variation of impurities such as Cu, Fe and Zn, variation of current densities and variations in temperature. The test program was successful in that the optimized data could be directly utilized for the final design package.
CAMP CLIENT PROJECT
Hydrometallurgical Technical Assistance for a Zinc Oxide Ore Body
In another international project, CAMP provided hydrometallurgical technical assistance for study on a zinc oxide property in the former Soviet Union. Included was an evaluation of potentially applicable technologies such as vat leaching, solvent extraction and electrowinning. As well a comprehensive metallurgical test plan was derived for the bankable feasibility study. In addition CAMP personnel acted as the client's representative in the selection process for the engineering house chosen to carry out the bankable feasibility study.
CAMP CLIENT PROJECT
Hydrometallurgical Testing and Engineering Expertise
for A Philippine Nickel/Cobalt Laterite Ore
CAMP provided hydrometallurgical testing and engineering expertise for a Philippine Nickel/Cobalt laterite study. CAMP performed all testing in support of the pre-feasibility level study including High Pressure Acid Leaching, Neutralization, Solvent Extraction, Mixed Sulfides Production, Mixed Sulfide leaching, and Hydrogen Reduction. In addition, novel methodologies for reduction in acid consumption and secondary product technologies were developed.
CAMP CLIENT PROJECT
JK-SimMettm Short Course
CAMP jointly hosted a course for students and industry personnel on the world's foremost mineral processing software, JK-SimMet. The five day course attracted and international contingent of attendees and focused on the newest versions of JK-SimMet software. In addition, as an adjunct to the course, tours of local mineral processing facilities were set up for the course participants.
Provision of Mineral Processing and Hydrometallurgical Technical
Expertise in Support of a Pre-feasibility Level Study on a
Complex Copper, Cobalt and Gold Mine
CAMP provided mineral processing and hydrometallurgical technical expertise in support of a pre-feasibility level study on a complex copper, cobalt and gold mine. CAMP personnel surveyed, studied and recommended appropriate milling, flotation, pressure leaching, solvent extraction and electrowinning technologies in order to derive plausible and environmentally sound flowsheets for the process. In addition, both capital and operating cost estimates were derived by CAMP personnel for the final process plants. Finally, a comprehensive metallurgical test program was outlined by CAMP for the bankable feasibility study slated to begin first quarter of 1999.
CAMP CLIENT PROJECT
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