La Calerita sodic alteration showing is found within an intrusive complex consisting mainly of hornblende-feldspar, porphyritic monzonite ("HFP") with a silicic core of hornblende quartz-feldspar porphyritic monzonite ("HQFP") both within a larger body of non-porphyritic hornblende diorite. The HQFP is silicified, albitized and cross-cut by quartz-tourmaline veinlets throughout. The hornblende crystals (according to the study of thin sections by Fonseca of Oro Gold) are commonly replaced by tourmaline. A sample taken of the sodic alteration in the HQFP was not particularly anomalous for gold or other metals.
The Hecla drilling in 1990, of a 325 m long fence of RC drillholes at La Calerite appears to have been focussed within and adjacent to, an elliptical shaped zone, of silica-albite alteration overprinted by tourmaline, with sporadic quartz, epidote, pyrite and chalcopyrite veinlets. The results of Hecla drilling (see Table 4) of the gold values of ten holes that averaged 1 g Au/t over 10 m, or more, at 0.5 g Au/t cutoff.
A grab sample by Oro Gold some 70 m south of the Hecla drilling reportedly gave 4.5 g Ag/t, 0.06% Cu and 1.1 g Au/t.
La Calerita
La Calerita
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