Drilling at Los Cerros Limited’s (ASX: LCL) Tesorito South porphyry target, part of the 100% owned Quinchia Project in Colombia, continues to deliver strong results with recently received assays from TS-DH15 extending the high-grade zone further west, and more recent drilling visuals (assays pending) offering additional encouragement.
Hole TS-DH15 was drilled ~60m further west and in the same drill fence as TS-DH11 given the strong gold values of TS-DH11 ‘mid-hole’ and further boosted by the more recent spectacular results of TS-DH14 (320m @ 1.5g/t Au from 2m) pushing high grade westward at depth.
TSDH15 recorded a broad zone of 215.1m @ 0.86g/t Au from 110.9m intercepting the following high grade sub-sections: 34m @ 1.97g/t Au and 0.1% Cu from 214m, including 10.6m @ 3.47g/t Au and 0.12% Cu from 219.4m; and 7.70m @ 2.13g/t Au and 0.1% Cu from 312.3m
TS-DH15 crossed through mainly altered andesites before entering the magmatic breccia and diorite that make up the target porphyry suite at ~91m downhole and then passed through the Marmato Fault at ~373m as modelled, ending in barren basalts.
Managing Director, Jason Stirbinskis, said it is noteworthy that TS-DH11 previously reported 262m @ 0.84g/t Au1 from surface including 32m grading 1.7g/t Au from 144m within 66m at 1.3g/t Au from 132m and entered basalts at ~312m.
At 214m downhole drill hole TSDH15 intersected the same high-grade zone encountered from ~144m downhole in TS-DH11. This has extended the high-grade gold zone, and therefore potential volume of high grade material, for an additional ~75m west and downdip.
Elevated copper content occurs as fine-grained chalcopyrite associated with zones of higher vein density near contacts within the porphyry and breccia. This is consistent with elevated copper grades reported in previous holes such as TS-DH02 and TSDH08.
Hole TS-DH16 was the first hole drilled with the company’s own Atlas Copco rig. It has performed exceptionally well and reached a depth of 690 metres, which is the deepest hole ever drilled at Tesorito.
TS-DH16 was designed to approach the porphyry core from the north east and then test potential extensions to the south west at depth. The hole was then extended to 690m to capture important structural information to support a developing regional hypothesis.
TS-DH16 crossed through mainly altered andesites, magmatic breccias and diorites that make up the target porphyry suite.
Based on visual logs only, with full assays expected in late March, much of the core down to 320m showed encouraging visuals similar to the mineralised core of surrounding holes.
The hole then traversed a zone of andesites common throughout the Marmato Fault corridor before crossing a fault modelled to exist in this location at 356m. The Company persisted through an additional 333m including entering a new 119.3m wide zone (463m to 582.3m) of magmatic breccias and diorites showing encouraging porphyry pathfinders and vein density.
“The company will refrain from offering an interpretation of this interesting and potentially exciting deep intercept of a porphyry suite below and south west of the fault structure until assays have been assimilated,” Mr Stirbinskis said.
“We are pleased with the performance of the company owned Atlas Copco rig during the course of its first drill hole.”