HAT PORPHYRY GEOLOGY
Hat Porphyry Geology:
Unlocking the Potential of the Hat Project
Welcome to the Hat Project, where the geological wonders of the Stikine Terrane and the Intermontane Physiographic Province converge to create a promising investment opportunity. Situated east of the Coast Range, the Hat Property boasts a rich mineralization that spans volcaniclastic rocks of Upper Triassic age and younger dioritic and gabbroic intrusions. Our team of dedicated geologists has been diligently studying and updating the geologic model, constantly refining our understanding of the deposit’s characteristics and boundaries.
Driving Exploration with Advanced Techniques:
At Doubleview Gold Corp, we embrace cutting-edge technologies and advanced geological techniques to enhance our exploration efforts. Through the utilization of state-of-the-art software and the application of sophisticated modeling methods, we maximize the value of our extensive database, encompassing various technical surveys and drilling information. Our ongoing study involves the meticulous entry of data from over 2200 samples into a comprehensive GIS Database (Geographic Information System). By employing innovative approaches like “Fuzzy Logic” routines and extrapolation, we extract valuable information on sulphide occurrences, alteration types, and more. This database-driven approach has provided fresh insights into the geological potential of the Hat Property, allowing us to make informed decisions.
Geological Setting and Metallogeny:
The Hat Project finds itself nestled within the Stikinia terrane, adjacent to the Coast Crystalline Belt. Its geological framework is dominated by the Stuhini formation, an Upper Triassic volcaniclastic unit akin to other renowned rock formations in British Columbia. Our exploration efforts have revealed the presence of various granitic plutons, reflecting regional structural styles aligned with the Cordilleran trends. Despite the challenges posed by Tertiary volcanoes and extensive basaltic lavas, we persist in our mission to unveil the hidden riches beneath these surface layers.
Unleashing Mining Potential in Northwest BC:
While most of British Columbia’s copper porphyry deposits are concentrated in the central “Quesnellia” terrane, the relatively unexplored “Stikinia” terrane hosts several active mines and numerous properties ripe for development. The Hat Project stands as a testament to the immense mineral potential this region holds. Within a 200 km radius of the Hat deposit, several deposits with significant production potential await exploration and development. Notable among them are the massive KSM-Pretium copper-gold-silver-molybdenum resources, the lucrative Galore Creek copper bodies, the expansive Copper Fox (Schaft Creek) copper-molybdenum deposit, and the recently commenced Red Chris mine. The area continues to attract a multitude of junior mining companies, making it the most active exploration hub in the Province. The future of mining in British Columbia undoubtedly lies in the abundant resources of Northwest BC.
Unveiling the Lisle Zone and Beyond:
Doubleview’s exploration efforts in 2014 resulted in the discovery of the Lisle Zone, an exciting addition to the Hat Project. While its exact dimensions and overall metal content are yet to be determined, the Zone extends over 900 meters horizontally and at least 350 meters vertically from the surface. Gold content closely correlates with copper values, ranging from 0.1 to 2 grams/tonne and copper from 0.2 to 1.5%. Drill holes H-11 and H-23 have provided encouraging results, further fueling our determination to unlock the full potential of this zone. Our ongoing exploration programs focus not only on the Lisle Zone but also on numerous untested anomalous areas with similar characteristics. Through meticulous investigations, we strive to define and prioritize these areas, enhancing our chances of uncovering further mineral treasures.
Hat Property Geology and Metallogeny:
Doubleview’s geological team, as part of an ongoing study of the Hat gold-copper alkalic porphyry deposit, is continually updating its geologic model. Exploration of the newly discovered “Lisle Zone” mineralized area in Northwest British Columbia is in the early stages of drilling to determine its geologic characteristics and to locate its boundaries. Along with a focus on that Zone, work has continued in order to better define and prioritize numerous anomalous areas that have similar but untested characteristics. Methods incorporates the application of data from the Company’s large database of various technical surveys and extrapolation of information from drill holes. The current study includes entry of data from more than 2200 samples into a large GIS Database (Geographic Information System) (Figure 1) that was then tested by a variety of modeling methods, including application of simple “Fuzzy Logic”-type routines to extract specific information, such as sulphide occurrences, or alteration types. Working with this database has given new perspectives of the geological potential of the Hat Property.
The Hat project lies in Stikinia terrane at the western edge of the Intermontane physiographic province, proximal to the Coast Crystalline Belt. Dominant rock types are related to the Stuhini formation, a volcaniclastic unit of Upper Triassic age that is similar to the Nicola and Takla Group rocks elsewhere in British Columbia and Lewes River Group in Yukon. Various granitic plutons are outliers of Coast Intrusions and regional structural styles conform to northwesterly Cordilleran trends. Tertiary and younger volcanoes that occur along a northerly alignment have resulted in large areas of flat-lying basaltic lavas that, along with extensive glacial till and outwash deposits, obscure underlying formations and frustrate mineral exploration.
Although most of British Columbia’s copper porphyry deposits are located in central “Quesnellia” terrane, a north-trending belt of intermediate volcaniclastic rocks that extends northerly through the length of the province, “Stikinia” terrane, with similar characteristics but is less explored, is host to several active mines and numerous properties that are either awaiting development or re-activation. In both terranes most deposits are closely related to dioritic and granodioritic plutons of Early- to Mid-Jurassic age.
Although northwestern British Columbia is endowed with a significant number of base metal deposits, the recently inaugurated Red Chris copper-gold mine is the only mine presently in production. Several historic mines are now closed or inactive and several properties have entered the permitting phase. Many deposits with realistic potential to achieve production are located within 200 km of the Hat deposit. Of particular note are the huge KSM-Pretium copper-gold-silver-molybdenum resources, the rich Galore Creek copper bodies, the very large Copper Fox, aka Schaft Creek, copper-molybdenum deposit, the above-noted, recently started Red Chris mine and the now-depleted very high-grade Eskay gold and silver mine. A large number of junior mining companies are active throughout the Northwest and it continues to be the most active exploration area of the Province. It appears certain that northwest BC is destined to become a very important mining area that will ensure the future of mining in B.C.
The overall shape and dimensions of the Lisle Zone, discovered by Doubleview in 2014, have not yet been defined but, on the basis of available drill hole data extends horizontally in excess of 900 metres and vertically to depths of at least 350 metres from surface. Gold content is closely related to copper values and commonly ranges from 0.1 to 2 grams/tonne, with copper from 0.2 to 1.5%. Drill hole H-11 returned 451 metres with 0.17 g/tonne gold and 0.22% copper and hole H-23 that intersected the Zone at greater depth returned 110 metres with 0.36 g/t gold and 0.47% copper. The outside dimensions, thickness and overall metal content of the Lisle Zone have not been determined and an apparent increase in metal values with depth has not been confirmed.
Hat Project Geological Framework:
Geologically speaking, the Hat complex is represented by andesitic volcanic and volcanoclastic rocks of late-Triassic Stuhini formation intruded by multi-phase dioritic and gabbroic intrusions, thought to be of early Jurassic age. The intrusions evolved to form significant sub-alkaline suite porphyry copper-gold systems and the porphyry intrusions and related hydrothermal fluids resulted in strong alteration footprints. The known Lisle zone porphyry copper-gold system as well as Hat property Anomalies A, E, C, D and the “Hoey” zones remain open in all directions and continued to be investigated during the exploration and drilling programs.
Magnetic Survey, Deposit and Porphyry Outline:
Porphyry copper deposits often, but not always, appear as magnetic highs, with alteration halos usually manifested as annular (donut-shaped) or open-ring peripheral magnetic lows (Heithersay and Walshe, 1995; Ford and others, 2007). Typically, there is significant variability in magnetic susceptibility throughout the altered rock owing to the nonhomogeneity of phyllic alteration-related magnetite destruction and late-stage magnetite formation (Gettings, 2005). [Preliminary Model of Porphyry Copper Deposits, USGS – Open-File Report 2008–1321 ]
Figure 1 illustrates detailed ground magnetic intensity of the Hat Porphyry system with observed sulphide mineral occurrences. The magnetic survey has been analyzed as a part of company’s update of its expanded Hat Project database.
Figure 2 shows an interpretation of the magnetic signatures.
Figure 2: Interpreted Circular Magnetic features and Corresponding Peripheral Areas of Low Magnetic Intensity (“Horse Shoe Zone”)