DHR announces positive update on Las Openas gold project

by Leena Thomas
Image: Dark Horse Resources Limited

Dark Horse Resources Limited (ASX: DHR) has announced a highly encouraging update from the ongoing surface sampling and detailed mapping program at its Las Opeñas Gold Project in Argentina.

The company reported that five new mineralized zones were identified within the project’s Presagio Target, extending its length to the east from 2.7km to 3.7km. The east extension has been termed Presagio East.

DHR reported that four of the five new mineralized zones returned anomalous Gold and Silver results, with two impressive bonanza Silver grades being 2,098 g/t and 272 g/t.

The company said that the best Gold‐Silver grades occur on east‐west flexures within veins associated with Pyrite, Sphalerite (Zinc Sulphide) and Galena (Lead Sulphide).

Dark Horse announced that more investigation will be undertaken in Presagio East to define the mineralization.

Las Opeñas project

The Las Opeñas Gold Project is located in the north-western region of the mining-friendly province of San Juan, Argentina. Dark Horse Resources Ltd, through subsidiaries and contractual rights, holds rights to the Las Openas tenements with Genesis Minerals.

The project is on the border of the Indio Belt, Argentina, where there are multi-million-ounce gold deposits including Veladero (12Moz) and Pascua Lama (18Moz).

DHR’s first phase drilling in March-April 2019 had confirmed high grade mineralised zones at Tramway and Presagio vein targets in Las Opeñas.

It may be noted that the Presagio Target has consistently returned high grade, anomalous results of Gold and Silver. The highest results of the drilling program were of 1m at 4.8 g/t Gold, 349 g/t Silver.

Ongoing surface sampling and mapping

DHR had recently commenced surface sampling and detailed mapping program at Las Opeñas.

The company reported that a greenfield discovery of 5 new mineralized zones at the Presagio Target has extended its length from 2.7km to 3.7km. This extension of Presagio is east of LORC‐19‐13, an area drilled in March‐April 2019.

The company said that this mineralized zone has been termed ‘Presagio East’ and has a strike length of 1.7km.

The company said that 30 samples were collected in total. DHR reported that four out of the five mineralized zones returned anomalous Gold and Silver results.

High-grade results

Dark Horse announced that the best results derive from one vein that returned particularly high bonanza grades of Silver at 2,098 g/t and 272 g/t.

The samples from Presagio East also returned anomalous Arsenic, Lead, and Zinc.

Mapping delineating the Presagio System

DHR said that the on‐going mapping is delineating the Presagio System as a complex vein set composed of multiple veins and vein breccias varying from 200m to 2,200m in length, stacked over a corridor width of 200m.

The system includes the Targets: Presagio West, Presagio, Presagio Sur, and Presagio East, along with smaller unnamed veins.

The company said that the best Gold and Silver grades, including the new bonanza grades, occur on east‐west flexures. DHR reported that within these veins are associations with Pyrite, Sphalerite (Zinc Sulphide) and Galena (Lead Sulphide).

It may be noted that the fault zone hosting the Presagio System terminates against a regional NE‐SW fault zone, which hosts the RockOven, Tramway and Vultur veins.

The company said that the interaction of these two faults has opened the Presagio structure to provide multiple pathways for mineralizing fluids and the subsequent formation of multiple veins and vein breccias, which have the potential to extend to depths in excess of 200m.

Latest updates and next steps

Dark Horse Resources reported that it has successfully defined new high grade, precious metal vein systems from ongoing surface exploration throughout the winter period and early spring.

The company said that it would continue this work and attempt to exhaust the extent of identifiable mineralisation within the Las Opeñas lease, to ensure that the next drilling phase optimizes the chances of resources discovery.

Dark Horse announced that the follow‐up mapping and sampling is currently in progress at Las Opeñas.