Caldera Resources encouraged by Abminga drilling

One hurdle has been cleared by Caldera Resources (CDR-M) in its program of anomaly investigation at the Abminga diamond exploration project in southern Australia,

The company has been drilling magnetic anomalies on concession area E-1936.

Geologists have recovered core samples of volcanic tuffs and volcanogenic crater-lake sediments which may represent the top of a volcanic pipe. The volcanic rocks also contain up to 40% olivine, confirming they are ultramafic.

Chromite grains taken from the samples are chemically identical to chromites formed at the pressures and temperatures that allow diamonds to form.

Typically, kimberlites and lamproites (the host rocks of diamond deposits) contain chromites with varying compositions, though only those rocks with chromites that fall in the diamond stability field are considered diamondiferous.

The company is also conducting mineralogical investigations on samples from other concessions in the Abminga area. It is studying results in hopes of developing exploration criteria that will allow for the quick selection of favorable anomalies.