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Lucero Target

Lucero Background

The Lucero discovery, located in the Taricori Block, was defined initially by coincident magnetic and electromagnetic geophysical anomalies and anomalous silt geochemistry. Follow-up work identified gold and copper soil and rock anomalies. Surface rock sampling and trenching (48.9 metres grading 3.97 g/t gold and 0.25% copper) defined a mineralized zone 1000 X 750 metres in area. Lucero is a 100% grass-roots discovery and was not previously exposed by informal miners. Lucero is a 100% grass-roots discovery and was not previously exposed by informal miners.

Lucero Results

Final assay results have now been received for the drilling at the Lucero gold-copper skarn project. Of the three types of mineralization identified at Lucero (skarn, sediment-hosted disseminated, and porphyry disseminated), the skarn mineralization is the most significant. However, the surface skarn mineralization has been subjected to post-mineral erosion, such that the skarn thickness varies from 10 meters to 150 meters depending on topography. In the area where the best gold mineralization occurs, skarn-hosted mineralization has been eroded, preserving approximately 20-30 metres of mineralization.

A conceptual geologic estimate of the resource at Lucero can be made assuming a consistent slab of skarn mineralization 25m thick and average grade of 1-1.5 g/t; the average specific gravity is assumed to be 3 (based on actual core measurements). Applying these figures to surface dimensions of 400 by 200m estimates that at Lucero there are about 6 million tonnes containing 190,000 to 280,000 ounces of gold. Note that, as per National Instrument 43-101 standards of disclosure, this estimate is conceptual in nature and there has been insufficient exploration to define a mineral resource; it is uncertain that further exploration will result in the target being delineated as a mineral resource. As Dorato is focussed on discovery of a large, bulk-tonnage resource, this conceptual estimate indicates Lucero is too small to warrant proving up this geologic estimate to the Inferred category with additional drilling. Therefore, no further exploration is planned at Lucero.

The final drillholes tested deeper disseminated mineralization beneath the skarn in the underlying arenite package. Neither hole intersected significant mineralization. Similarly, the deep hole drilled into the intrusions underlying the skarn from the south (LUC-19) did not intersect significant porphyry mineralization.

		Click to Enlarge Photo Hole LUC-08 between 36.7m and 39.4m depth; semi-massive pyrite, pyrrhotite and chalcopyrite near base of skarn in. From 37.0 to 38.3m it graded 1.85 g/t Au, from 38.3 to 38.7 it graded 6.08 g/t Au, and from 38.7 to 39.4 it graded 5.22 g/t Au. Note that gold grades correlate well with the amount of chalcopyrite.
		Click to Enlarge Photo Hole LUC-13 at 75m depth; strongly silicified arenite; note stringers of pyrite and blebs of chalcopyrite; the dark silica contains very finely disseminated chalcopyrite and pyrite.
		Click to Enlarge Photo Hole LUC-13 at 185m depth; intense stockwork of fine pyrite-chalcopyrite veinlets and fine disseminated chalcopyrite-pyrite in vein envelopes.
		Click to Enlarge Photo Hole LUC-14 at 290m depth; unconformable contact between potassic-altered (note brown secondary biotite) granodiorite of the Zamora batholith and overlying arenite, showing moderated silicification and clouds of fine disseminated and veinlet chalcopyrite-pyrite.
		Click to Enlarge Photo Hole LUC-19 at 251m depth; intense potassic alteration in Zamora granodiorite; note the secondary biotite is obscuring the primary texture. Early A-veins are common, with later quartz-molybdenite and quartz-chalcopyrite veins less common.
		Click to Enlarge Photo Hole LUC-19 at 252.5m; note quartz-chalcopyrite vein. Most of the chalcopyrite occurs as much finer disseminations and in most places is equal to or exceeds pyrite.
		Click to Enlarge Photo Hole LUC-19 at 111m depth; silicified dacite porphyry with common quartz-molybdenite stockwork veins; this dike cuts the arenite that overlies the granodiorite and is therefore considered to be temporally related to mineralization and alteration at Lucero.