This rock over thousands of years erodes off the mountains and travels down the river systems moved by water flow and deposited over the river flood plains. CJ Industries obtain Resource Consents to extract this alluvial gravel from the flood plains of the Motueka river. This material is then washed and sized and is used for high value products such as sealing chip, sand and stone used in concrete production.
CJ Industries owns and manages 3 Hard Rock Quarries in the Tasman District. This rock needs to be blasted or ripped with heavy machinery from the hillside. This material is then crushed to different sizes and mainly used for road and building foundation construction.