Refractory gold ores are typified by the presence of either ultra-fine gold particles disseminated throughout the gold bearing mineralization, or, gold in solid-solution within the mineral matrix. Common refractory gold bearing minerals include arsenopyrite, pyrite and copper sulphides, which are highly resistant to extraction by standard cyanidation and usually require pre-treatment for cyanidation to be effective. There are many factors to consider in refractory gold ore evaluation and multiple pre-treatment options are available, some of which maybe better suited to a particular ore or project than others. ALS is expert in all options and can advise on an appropriate testing program to determine the optimum processing solution.
Refractory gold ores generally contain sulphide minerals, and as such, a primary flotation stage is the obvious choice to concentrate the sulphides into a smaller mass for downstream pre-treatment prior to cyanidation rather than whole of ore processing. Gold sulphide flotation is relatively straightforward and ALS can seamlessly marry this into the testing program via its fully equipped flotation laboratory in conjunction with other process flowsheets.
Once recovered into a smaller mass, the sulphides can be pre-treated via the following processes:
Similarly to a free milling program, this will depend on the number of pre-treatment options selected and the number of test conducted. With the usual requirement to produce a flotation concentrate in sufficient mass for downstream testing, typically a parcel of 100-200 kg should be sufficient for a standard program.
Yes, the only limits to how many flowsheet options can be tested are mass and budget.
Yes, of course. Large or small, we cater for all customer requirements.
Yes, no problem.
Yes, ALS can filter your plant slurry samples as required or treat them as received.
Yes, this is a very common service and extends to all plant samples.
Generally, yes. ALS has facilities and procedures to treat fibrous and radioactive samples. Surcharges do apply, however, to cover safety equipment, monitoring and decontamination.
ALS is a quarantine approved premises and treats many samples of oversea origin. Strict regulatory requirements are in needed around packaging and paperwork, however. ALS can advise you on these requirements.
Generally, no. Insurance and safety protocols typically prevent renting laboratory space and this is not part of ALS’s business model. Clients are able to visit and witness testwork but this is to observe only. Typically, clients may attend on 24/7 piloting campaigns and interact with senior staff members for technical and operational issues.
Yes, clients are always welcome to visit our facilities and observe samples or tests in progress. Inductions are required and other rules may apply to visitors.
Yes, if a testwork program is in progress, ALS will happily dispatch testwork products and feed samples to vendors, third party laboratories, and customers as required. Fees apply.
No, as it is not our core business and would put us in direct competition with many of our clients. We can, however, put you in contact with a range of reputable engineering providers and consultants.
The above refractory gold metallurgical testwork is usually conducted together with other testwork, such as:
Click on the above links or contact us for further information. We can integrate a full program for you if required.