Dump or heap leaching

Here are some frequently asked questions

• How much sample mass do I need for a heap leach program?

  This depends on the sample bulk density selected (in-situ SG), typically each 1m column requires approximately 10 kg, however for larger 300mm dia columns a sample mass of 400- 500kg is required.

• How important is agglomeration?

  This is very important to ensure well-formed strong agglomerates are maintained during the column leach. Typically, a binder with acid is used and the agglomerates allowed to cure. A Kappes percolation test is typically conducted to confirm the agglomeration process.

• How is temperature maintained during column leaching?

  Columns can be wrapped in heating blankets, which are temperature controlled.

• How long do columns operate for?

  This depends on the type of column leach, typically Nickel laterites and Uranium ores can operate from 12-24+ weeks, while Cu columns can be much quicker at 4-6 weeks.

• Can columns be sampled during weekends and public holidays?

  Yes, ALS can offer a sampling regime to suit the analytical requirements for the testwork. Some additional fees cover these situations which are common during column leaching programs.

• Can I do my own testwork in ALS’s laboratory?

  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 interactions.

• Can my associates and I view the testwork at ALS’s laboratory?

  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.

• Will ALS dispatch my samples to third parties?

  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.

• Does ALS do design engineering and consulting?

  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.