GUAIMARALA17 Mar 2022 08:28
There used to be a poster here. AGEOS, who is a geologist. He wrote about Guaimarala some time ago , which I guess got me interested in Guaimarala. With the finding recently of high grade rocks, surely something to look for now that they should be or should start working there soon.
AGEOS Wrote:
"Leaving aside the APTA discovery, for which infill and step-out drilling will be required at some stage, one of the most interesting prospects to emerge so far appears to be that which is centred on the Au-As anomaly identified last June (RNS 07.06.18) in the Guaimarala area c2km SW of APTA. There are positive gold and arsenic correlations elsewhere, at APTA and Charrascala but this occurrence is extensive and as is clear from figure 3 in the June RNS there are relatively high values for both elements in the soil geochemistry.
High arsenic is indicative , but not diagnostic, of late stage high-grade Au-Ag mineralization, usually as vein swarms, stockworks or brecciation, in CBM (Carbonate Base Metal) Systems, of which the recently discovered very high-grade extensions at Buritica (mentioned by MrP) are an example. Furthermore the occurrence at Guaimarala appears to coincide with the intersection of two major faults, the NW-SE Caracol Fault and the N-S Pederero Fault. Interceptions of post-Cretaceous, pre-Miocene high-angle faults in the Cauca belt appear to offer the structural setting for Miocene-age porphyry intrusions, so the inference is that there could be such an intrusion at depth beneath the anomaly with late stage Au-Ag mineralization in the periphery.
Of the 5 scout-holes drilled at Charrascala c1.5km to the NW, 4 intersected veinlet zones with significant Au-Ag and high sulphides, mostly pyrite with pyrrhotite, chalcopyrite and sphalerite. The NI Report also mentions stockworks, veins of quartz with carbonates and extensive silicification, all consistent with a CBM model. The June RNS also mentions “a well-developed alteration mineral suite” which I assume may allude to a possible thermal aureole, a further indication of an intrusive complex in the vicinity.
If the forthcoming drilling programme prioritizes the Guaimarala-Charrascala area it will probably be in anticipation of a potentially very significant mesothermal to epithermal Miocene-age resource".
"AGEOS".