Dry Density Ore Volume (tonnage) Estimation & Moisture Content Measurement

Hard Rock miners need to know in-situ dry bulk density to accurately estimate the amount of resource in the ore body and do reserves calculations, but no direct downhole measurement of dry bulk density is possible. To get around this limitation, geologists estimate dry bulk density by calculating the ratio between the mass after drying and volume of core samples. This process however is prone to errors and can be time consuming and problematic with porous or unconsolidated samples.

Another critical aspect to resources is the amount of water retained with in the rock matrix or moisture. Understanding the in-situ moisture content of the ore is critical because this property provides insights related to many aspects of the mining process, from quantifying ore handleability, determining the appropriate blending required at the crushers, to complying with Transport Moisture Limit (TML) guidelines.

Surtech Systems’ uses a combination of complementing logging services that collectively provide the inputs necessary to calculate a continuous dry-bulk density and in-situ moisture content over a logged interval; a standard gamma-gamma density tool and a BMR instrument provide all the data required to perform this calculation.

David Hopper Dry Density JPG