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New screen for Oparure Quarry

New screen for Oparure Quarry
The new scalping screen installed at Graymont’s Oparure Quarry, near Te Kuiti.

MIMICO has recently completed the installation of a scalping screen at Graymont’s Oparure Quarry, near Te Kuiti.

The Oparure Quarry is New Zealand’s largest single lime quarry.

It sits on a 67-hectare site which is located on top of the rich Waitomo strata and produces exceptionally high-grade limestone for supply to Graymont’s Otorohanga and Te Kuiti Plants.

The main driver behind having the screen installed was to help the Oparure operation recover usable product from what was previously waste primary scalp product.

A refurbished Svedala VFS screen was supplied, with special design considerations required due to the sticky nature of the limestone feed stock and the confined installation space.

A screen bypass option was designed into the screen structure, to enable rejection of high clay content feed stock. Th e screen was fitted with Trellex rubber media to help it handle the sticky feed stock.

Special non-stick liners were installed in key transfer points and Metso Trellex belt scrapers used to provide superior cleaning of all conveyor belts.

MIMICO, the New Zealand distributor of Metso and Trellex equipment, provided the product expertise and refurbished screen, while the MIMICO Engineering division (previously QMI Engineering) designed and fabricated the screen structure, conveyors and all chute work.

The Oparure plant also manufactures a range of high quality pulverised limestone products such as ag-lime, CalcimateTM and industrial fine lime in bags, bulk bags and bulk, as well as aggregates in bulk, predominantly supplying customers across the North Island.