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Las Cruces


The Las Cruces mine is an open pit operation and process plant located in the Sevilla Province of Southern Spain.

The mine uses leaching and electrowinning technology to produce copper cathode. The plant is designed to produce approximately 72,000 tonnes of copper cathode per year which is shipped as final product.

Mining and Processing

Las Cruces uses conventional open pit mining methods, based upon hydraulic shovels and trucks, with drilling and blasting in the lower marls and ore zones. The project has a relatively high stripping ratio supported by the high grade ore. Las Cruces uses contract miners for all mine production.

Ore at Las Cruces is mined from an open pit.  The metallurgical plant relies on an atmospheric leaching process to recover copper from the rich Las Cruces chalcocite ore. A unique feature of the plant is the use of eight OKTOP agitated reactors to dissolve the copper under conditions of high temperature and high acidity. Oxygen is also added into the reactors to complete the reaction. The feed to the leaching reactors is mine ore that has passed through three stages of crushing and a single stage of grinding.

Once leached, the liquid is separated from the ground solids to become PLS, the feed for the solvent extraction (“SX”) area. In the SX area the copper is passed to an organic solution and then to the electrolyte that feeds the electrowinning cells. The electrowinning cells produce LME grade copper cathodes weighing approximately 50 kilograms each. An automated crane and stripping machine then harvests and packages the cathodes for shipment.

2018 Facts and Stats:

  • Copper cathode production (tonnes): 70,738
  • Copper cathode sales (tonnes): 71,523
  • Average copper grade processed: 4.95%
  • Type of mine: open pit
  • Current estimated mine life: 2020
  • Employees: 250
  • Contractors:650

Outlook:

On January 23, 2019, operations were temporarily suspended following a land slippage on the slope of the northern zone of the open pit mine. There were no injuries or impact on third party facilities or land resulting from the land slippage. The suspension of operations is currently estimated to result in approximately 25,000 tonnes of lost copper production in 2019. Planned production for 2020 has also been reduced by a further 25,000 tonnes from amounts previously disclosed as certain high grade ore is no longer expected to be mined as part of the open pit operation.

Copper production for 2019 is expected to be 45,000 tonnes. The hydrometallurgical plant resumed copper production on February 1, 2019, processing lower grade ore stockpiles. This is expected to provide feed for the next several months while the Company obtains the necessary regulatory approvals for the commencement of mining of Phase 6, which was unaffected by the land slippage.