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![]() One of the Region's Most Important Gold Targets
Robertson is an advanced-staged exploration project located along the Cortez Gold trend in north-central Nevada and immediately adjacent to the Pipeline gold mine. Over the past 20 years, Coral Gold and its various venture partners have spent more than $25 million exploring the claims. This activity has led to discovery of five mineralized zones: Porphyry, 39A, Gold Pan, Altenburg Hill and Distal.
The following key elements make Robertson one of the regions prime targets for gold exploration:
Gold Zones Continue to Expand Exploratory drilling conducted by Coral Gold between 2004 and 2006 has significantly expanded the Robertson gold resources which were estimated in late 2007 by Beacon Hill Consultants (1988) Ltd. and are summarized below (from Mineral Resource Estimate for the Robertson Property, Lander County, Nevada USA, January 2008).
Exploration in 2008 will focus on upgrading and expanding current oxide resources, step out drilling to identify new mineralized zones and determine metallurgical characteristics for production planning. Deep Pipeline-Type Mineralization While expanding the shallow resources in 2006, Coral Gold also completed an exploration program of detailed gravity, geological mapping, rock chip and grid soil sampling, and re-interpretation of existing airborne magnetics. The exploration results identified a number of important structural and geochemical anomalies similar to those over recent "deep" gold discoveries at Cortez Hills, deep Pipeline and numerous other deposits along the Cortez and Carlin Trends The anomalies include:
In 2007, Coral Gold completed two deep drill holes aimed at testing a portion of a major NNW-striking, dike-filled, high-angle fault system above projected lower plate host rocks. Drill targets were selected based on coincident multi-element geochemical anomalies and mapped faults with strong geophysical expressions that define these structures as major gold fluid conduits. One of the holes intersected strongly argillized limestone of the lower plate starting at 3,080 ft in the immediate footwall of a dike-filled high-angle fault. The upper 200 ft of the lower plate intercept returned strongly anomalous gold values ranging from 30 to 2,190 ppb, accompanied by anomalous levels for arsenic (100-1,990 ppm), antimony (0.4-18.2 ppm) and thallium (0.4-4.5 ppm). The gold values and associated trace elements confirm Carlin-type mineralization on the Robertson property. The discovery and development of the Cortez Hills deposit at depths comparable to that of Coral's recent drill intercepts, has confirmed the presents of deep high-grade mineralization along the Cortez Trend that is mineable by underground methods. This discovery has changed exploration strategies along the trend from one focused on near-surface exploration to the discovery of deeper high-grade deposits. Most major gold deposits and prospects on the Cortez Trend are associated with gold showings in lower plate rocks. The deep gold intercepts at Robertson provide strong evidence for a new deep mineralized zone which will require additional drilling to assess its potential to host one or more Carlin-type, high grade gold deposits. The 2008, exploration program on the Robertson Property will also include continued work on the deep gold targets. Geology Robertson lies along the far eastern flank of the Northern Shoshone Mountains in north-central Nevada within the Basin and Range physiographic province of western North America. The region lies at or very near the rifted margin of continental crust which was subjected to periodic thrust faulting starting in Middle Paleozoic and continuing until Late Cretaceous. The most important of these events affecting the region is a complex set of branching, low-angle faults that are part of the Roberts Mountains thrust fault system. The upper plate of this regional structure is a series of thick, complexly faulted dark-gray, fine-grained siliceous sedimentary and lesser submarine volcanic rocks of early to middle Paleozoic age. While siliceous rocks of the upper plate are widespread in the region, carbonate rocks of the lower plate are comparatively rare and are exposed in a few "structural windows" such as the Gold Acres and Cortez windows that contain most of Barrick's gold mines along the Cortez Trend. At Robertson the +2 million ounce inferred gold resources are hosted in upper plate rocks in close proximity to Tertiary-age (Eocene-Oligocene) intrusive rocks. In Nevada, emplacement of intrusive rocks is often controlled by anticlinal folds and faults developed in the lower plate. Together, these features provide a complex set of pathways for migrating gold-bearing fluids that ultimately formed the shallow gold resources at Robertson. These same resources might also be considered major "leakage" anomalies above possible gold mineralization hosted in lower plate rocks. This interpretation represents a lower Cortez Hills-type target concept for the Robertson Property in which one or more high-grade gold deposits, mineable from underground, might be discovered. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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