Wetland restoration, finding a use for waste rock, and a partnership with local iwi make for sustainable limestone quarrying at Ravensdown’s Supreme Lime operation in the Waikato.

Ravensdown’s Supreme Lime quarry occupies rolling King Country grazing land near Waitomo, producing around 100,000 tonnes of mostly agricultural limestone annually to a central and lower North Island market. Crushed limestone promotes pasture soil health by raising pH to levels at which nutrients are available to plants.

The operation dates from the 1940s, and employs four full-time staff and, depending on the time of year, 2-4 full-time contractors.