Take the next step.

Contact us to discuss your scope of work or send us your testing requirements, and we will put together a quote and/or comprehensive tender.

Get in touch with us?

Have questions or comments about our atmospheric testing services? Please send us a message and we will get in touch with you soon.


Heap leaching amenability

Huge multi column facility

Dump and heap leaching (via irrigation and percolation of cyanide onto and through the material) is often the selected process option for many marginal low-grade orebodies or pre-existing waste/tailings dumps. In 2021 ALS has expanded into a new bespoke column leaching facility that offers a full range of heap and dump leaching services, covering basic scoping tests through to feasibility studies on larger scale continuous columns.

lixiviação em monte

Heap leaching testwork services

In place of heaps and dumps, laboratory testing is ultimately conducted in columns of various sizes. Column leaching using cyanide solution to assess heap-leaching potential of gold bearing ores usually follows the following processes:

An important consideration in laboratory test programs is that the prepared samples have a size distribution that approximates a commercial crushing plant output for the desired top-size. This may require appropriate adjustment of the primary crushed product to avoid a disproportionate distribution in the coarse-end sizing.

ALS has also conducted sequential column tests whereby leach solution from one column is used to irrigate a second column in series. Loaded leach solutions can be passed through activated carbon columns and the regenerated cyanide solution recycled.

Don't quite see what you're looking for or need more information?

ALS understands that every gold program needs a tailored testing flowsheet specific to the ore.

Please contact us for further details.

Here are some frequently asked questions

Associated testwork services

Related testwork

Gold ores and the associated free milling metallurgical testwork results very often don’t fit into nice categories and packages and will often require 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.