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Gravity Map . . . Magnetic Map
Kimberlite . . . Indicator Minerals

 

 

 

 

 

Sulphide deposits in the Bathurst camp generally have maximum thicknesses measuring tens of metres. Structural deformation has resulted in many of them having steep attitudes. Based on these characteristics, and using available density information, it is possible to estimate the size of gravity anomaly expected over a deposit in a particular setting. For example, a steeply dipping, sheet-like sulphide body having a width of 50 m, a strike length of 500 m and a depth extent of 300 m, hosted by felsic or sedimentary rocks would produce a 3 mGal amplitude anomaly for zero metres depth of burial. Progressive burial results in smoothing out of the anomaly and attenuation of its amplitude. The chart to the left shows the effect of burial on the amplitude. At just 50 m depth it is already reduced to about 1.5 mGal, and at 100 m depth it is 1 mGal. Nevertheless, the anomaly remains distinct, and judicious inspection in the context of the prevailing geology should result in its identification as an anomaly warranting further investigation.

 

 

Using Gravity Maps to Find Sulphides