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Orinoco to change milling process at Cascavel gold project in Brazil


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Orinoco to change milling process at Cascavel gold project in Brazil

Orinoco Gold Ltd. decided to start using more traditional routes to mill its ore from the Cascavel gold project in Brazil as part of its "Back to Basics" approach.

The company said Dec. 18 that tests showed that recovery and grade can dramatically improve when it is not sent to the gravity recovery plant.

Using a hammer mill can result in recoveries of over 90% and grades ranging between 30 g/t and 149 g/t of gold, compared to recoveries of 73% to 80% and an average head grade of only 1.6 g/t to 2.1 g/t of gold when using the gravity plant.

The company will commission its first hammer mill, bought for under A$25,000, within a week and plans to purchase a second one in January 2018, depending on results.

In October, Orinoco estimated a JORC 2012-compliant maiden mineral resource at the Cascavel mine of 4,500 tonnes at an average grade of 15.4 g/t gold for 2,200 ounces of contained gold.

Meanwhile, Orinoco promoted Cascavel mining manager Richard Crew to the COO role, and Brian Thomas stepped down as the nonexecutive chairman.

Additionally, Jeremy Gray was appointed managing director of the company and will replace Jonathan Challis on the board, who resigned as a nonexecutive director.