Description
Location: Western Folk Life Center, 501 Railroad St., Elko, NV
Contact: justin.b.milliard@gmail.com
The Elko GSN Chapter is excited to have Scott Price of Sitka Gold Corp speaking at our April meeting at the Western Folk Life Center on Thursday April 20th. Scott will be presenting on the Alpha project.
The event is graciously hosted by: WALSH RECLAMATION, INC.
Food and drinks @ 6 pm, talk to being at 7 pm.
Title: The Path from Geologic Concept toward Carlin-type Gold Discovery, Alpha Gold Project, Cortez Trend, Nevada
Presenter: Scott Price
Abstract:
Early stage drilling at Alpha has identified a blind subsurface Carlin-type gold occurrence along a NNW trending anticline. The first ten drillholes on the still poorly defined fold trend have all intercepted broad intervals of gold and Carlin pathfinders in strong decalcification and silicification. Gold grade-thicknesses of 6 to 37 gram-meters in seven of ten holes support a throughgoing undrilled 2.5 km target zone along the fold that is open to the south. Gold and alteration follow calcareous siltstone, calc arenite, and fossiliferous debris flow strata immediately above the Devils Gate Limestone, dated as Late Devonian by Famennian Angustidontis arthropod appendages in closely overlying mudstone. These host strata are correlative with the Horse Canyon Formation in the Cortez district 40 km to the NNW. On surface, above the drill indicated gold occurrence, non-reactive shale and chert are commonly unaltered. Clay-limonite altered Eocene rhyolite dikes are barren at surface but control several drillhole gold intercepts and strong arsenic anomalies at depth. The dikes are part of an Eocene volcanic and shallow intrusive complex centered mostly east of the drilling area. Structure and bedding controlled limonite, hematite, clay, and scorodite locally occur in shale along the target trend. Limestone and calcareous sandstone at the top of the capping siliciclastic section commonly display pervasive decalcification and silicification but are geochemically weak. No prior drilling or historic prospecting is evident over the gold occurrence. West of Alpha, widespread surface alteration and geochemistry with historic prospecting and drilling is present where the east dipping host rock comes to surface. The McColley Canyon Fm, a second deeper host horizon, underlies the entire area and is an additional untested target at Alpha. The McColley Canyon Fm is the primary host at the McEwen Gold Bar Mine 15 km to the southwest and is time equivalent to the Wenban Fm Unit 5, the primary host at Goldrush.
Targeting at Alpha is now aimed at better defining the anticline geometry, testing the throughgoing target zone and identifying secondary structural mineralization controls. Surface exposures provide only limited information due to poorly exposed recessive stratigraphy, complex small-scale folding, and post-mineral tilting. Drilling has tested mostly the east limb of the anticline with grade increasing significantly up limb, producing a best intercept of 21.3m @ 1.21 g/t Au, and a peak grade of 4.62 g/t Au. Defining the fold crest/hinge and finding wider intervals +4 g/t Au is the ultimate objective. Secondary structural targets should also be important, including the zone of higher fracture intensity in the axial plane of the anticline, northerly dike-filled normal faults along the anticline trend, a northwest striking reverse fault, and altered cross-structures. At Frazier Creek, 5.5 km SSE along trend, strong alteration on NNW faults and deeper stratigraphic exposures may represent the same fold implying an 8 km total target length. The first hole at Frazier Creek intercepted a major pyritic dike-filled fault zone and failed to reach the host rock horizon. Stratigraphic data from the hole suggest a target depth of 450-550m.
Walsh Reclamation
We provide the building of roads, sumps, drill pads, vac-truck services to support the drilling industry and reclamation services to mining, exploration and other companies in the Northern region of Nevada. We have been in business since 1993, and strive to be environmentally aware of the land and habitat. We have an impeccable safety record and highly enforce the importance of safety to our employees.
Details
04/20/2023 18:00:0004/20/2023 20:30:00America/Los_AngelesGSN Elko Chapter Meeting – Thursday, April 20, 2023The Elko GSN Chapter is excited to have Scott Price of Sitka Gold Corp speaking at our April meeting at the Western Folk Life Center on Thursday April 20th. Scott will be presenting on the Alpha project. The event is graciously hosted by: WALSH RECLAMATION, INC. Food and drinks @ 6 pm, talk to being at 7 pm. Title: The Path from Geologic Concept toward Carlin-type Gold Discovery, Alpha Gold Project, Cortez Trend, Nevada Presenter: Scott Price Abstract: Early stage drilling at Alpha has identified a blind subsurface Carlin-type gold occurrence along a NNW trending anticline. The first ten drillholes on the still poorly defined fold trend have all intercepted broad intervals of gold and Carlin pathfinders in strong decalcification and silicification. Gold grade-thicknesses of 6 to 37 gram-meters in seven of ten holes support a throughgoing undrilled 2.5 km target zone along the fold that is open to the south. Gold and alteration follow calcareous siltstone, calc arenite, and fossiliferous debris flow strata immediately above the Devils Gate Limestone, dated as Late Devonian by Famennian Angustidontis arthropod appendages in closely overlying mudstone. These host strata are correlative with the Horse Canyon Formation in the Cortez district 40 km to the NNW. On surface, above the drill indicated gold occurrence, non-reactive shale and chert are commonly unaltered. Clay-limonite altered Eocene rhyolite dikes are barren at surface but control several drillhole gold intercepts and strong arsenic anomalies at depth. The dikes are part of an Eocene volcanic and shallow intrusive complex centered mostly east of the drilling area. Structure and bedding controlled limonite, hematite, clay, and scorodite locally occur in shale along the target trend. Limestone and calcareous sandstone at the top of the capping siliciclastic section commonly display pervasive decalcification and silicification but are geochemically weak. No prior drilling or historic prospecting is evident over the gold occurrence. West of Alpha, widespread surface alteration and geochemistry with historic prospecting and drilling is present where the east dipping host rock comes to surface. The McColley Canyon Fm, a second deeper host horizon, underlies the entire area and is an additional untested target at Alpha. The McColley Canyon Fm is the primary host at the McEwen Gold Bar Mine 15 km to the southwest and is time equivalent to the Wenban Fm Unit 5, the primary host at Goldrush. Targeting at Alpha is now aimed at better defining the anticline geometry, testing the throughgoing target zone and identifying secondary structural mineralization controls. Surface exposures provide only limited information due to poorly exposed recessive stratigraphy, complex small-scale folding, and post-mineral tilting. Drilling has tested mostly the east limb of the anticline with grade increasing significantly up limb, producing a best intercept of 21.3m @ 1.21 g/t Au, and a peak grade of 4.62 g/t Au. Defining the fold crest/hinge and finding wider intervals +4 g/t Au is the ultimate objective. Secondary structural targets should also be important, including the zone of higher fracture intensity in the axial plane of the anticline, northerly dike-filled normal faults along the anticline trend, a northwest striking reverse fault, and altered cross-structures. At Frazier Creek, 5.5 km SSE along trend, strong alteration on NNW faults and deeper stratigraphic exposures may represent the same fold implying an 8 km total target length. The first hole at Frazier Creek intercepted a major pyritic dike-filled fault zone and failed to reach the host rock horizon. Stratigraphic data from the hole suggest a target depth of 450-550m. Walsh Reclamation We provide the building of roads, sumps, drill pads, vac-truck services to support the drilling industry and reclamation services to mining, exploration and other companies in the Northern region of Nevada. We have been in business since 1993, and strive to be environmentally aware of the land and habitat. We have an impeccable safety record and highly enforce the importance of safety to our employees. http://www.walshreclamationinc.com/Reno, NV| Event Starts | Event Ends |
| 04/20/2023 | 04/20/2023 |
| All Day Event | |
| 6:00pm | 8:30pm |