Description

Location: Zoom from Winnemucca, NV

Contact: cpeters@ridgelineminerals.com

GSN WINNEMUCCA CHAPTER – Wednesday, March 10th at 7 p.m.

The GSN Winnemucca Chapter is hosting a virtual lecture on Wednesday, March 10th at 7:00 p.m.   The Zoom Login will be emailed to all GSN members prior to the meeting.

Thank you, Chad Peters, Winnemucca Chapter President, cpeters@ridgelineminerals.com

Speaker:   Greg Dering, Headwater Gold

Title: “Precious Metal Potential in the Owyhee Epithermal Belt, Southeast Oregon and Southwest Idaho: Examples from the Katey and Mahogany Projects

Abstract:

The Owyhee Epithermal Belt (OEB) herein refers to a northwest-trending cluster of epithermal precious metal deposits and prospects associated with mid-Miocene bimodal volcanism, caldera complexes, and extensional basins in southwestern Idaho and southeastern Oregon.  The OEB encompasses the Owhyee Mountains of Idaho and the Lake Owyhee volcanic field of southeast Oregon (Rytuba and Vander Meulen, 1990) and is similar to the Northern Nevada Rift (NNR) epithermal belt to the south in terms of scale, timing, and purported genetic origin.  Despite the similarities to the NNR, and clear potential as demonstrated by the DeLamar deposit (3.9 Moz AuEq M&I) and the Grassy Mountain deposit (1.1 Moz Au M&I), the region has seen little exploration in the past 30 years, and almost no exploration specifically focused on high-grade vein targets.  During a regional reconnaissance and data review campaign in 2019, Headwater Gold Inc. identified and staked several high-grade target areas in the OEB, including the Katey and Mahogany epithermal systems.

The Mahogany and Katey properties lie 30 km and 50 km NW of DeLamar, respectively, and were first identified in the mid-1980s by Manville Corp. At Mahogany Manville discovered high-level chalcedonic veins containing up to 3.3 g/t Au, and mineralized vent breccias with meter-scale blocks of sinter in a silicified matrix that assayed up to 0.6 g/t Au. Rock chip sampling undertaken in 2020 yielded up to 170 g/t Au from a previously unrecognized narrow high-angle crackle breccia zone along a property-scale fault at Mahogany. Mineralization is typical of hot spring-type low-sulfidation epithermal systems and is characterized by widespread chalcedonic silica alteration and a kaolinite-smectite-illite halo. The presence of sinter clasts in the vent breccias, with chalcedonic silica flooding and veining, suggest that the system is nearly fully preserved and that a high-grade, structurally hosted vein target remains untested at depths below 100 m.

Shallow high-grade gold mineralization and alteration at Katey is hosted in a linear rhyolite flow-dome setting at the margin of the Three Fingers caldera. Fracture zones developed at the margin of the Three Fingers Caldera margin appear to be important controls on mineralization and the emplacement of rhyolitic plugs and domes. High-silica porphyritic rhyolite on the eastern part of the property hosts chalcedonic stockwork veins where historic channel sampling yielded up to 5 g/t Au over 5 ft. In the western part of the property pervasively silicified intracaldera tuff and sandstone are cut by quartz-carbonate veins that yielded up to 9 g/t Au and 36 g/t Ag. Limited historic drilling by Manville and ASARCO from 1988 to 1990 tested shallow bulk tonnage targets at Katey, which encountered significant mineralization up to 0.7 g/t Au over 120 ft. Recent detailed geologic mapping, soil and rock chip geochemistry, and high-resolution drone magnetics together highlight several prospective targets at both properties which Headwater plans to drill test in 2021.

Details

03/10/2021 19:00:0003/10/2021 20:30:00America/Los_AngelesGSN WINNEMUCCA CHAPTER MEETING – March 10, 2021 @ 7 PM

GSN WINNEMUCCA CHAPTER - Wednesday, March 10th at 7 p.m.

The GSN Winnemucca Chapter is hosting a virtual lecture on Wednesday, March 10th at 7:00 p.m.   The Zoom Login will be emailed to all GSN members prior to the meeting.

Thank you, Chad Peters, Winnemucca Chapter President, cpeters@ridgelineminerals.com

Speaker:   Greg Dering, Headwater Gold

Title: “Precious Metal Potential in the Owyhee Epithermal Belt, Southeast Oregon and Southwest Idaho: Examples from the Katey and Mahogany Projects

Abstract: The Owyhee Epithermal Belt (OEB) herein refers to a northwest-trending cluster of epithermal precious metal deposits and prospects associated with mid-Miocene bimodal volcanism, caldera complexes, and extensional basins in southwestern Idaho and southeastern Oregon.  The OEB encompasses the Owhyee Mountains of Idaho and the Lake Owyhee volcanic field of southeast Oregon (Rytuba and Vander Meulen, 1990) and is similar to the Northern Nevada Rift (NNR) epithermal belt to the south in terms of scale, timing, and purported genetic origin.  Despite the similarities to the NNR, and clear potential as demonstrated by the DeLamar deposit (3.9 Moz AuEq M&I) and the Grassy Mountain deposit (1.1 Moz Au M&I), the region has seen little exploration in the past 30 years, and almost no exploration specifically focused on high-grade vein targets.  During a regional reconnaissance and data review campaign in 2019, Headwater Gold Inc. identified and staked several high-grade target areas in the OEB, including the Katey and Mahogany epithermal systems. The Mahogany and Katey properties lie 30 km and 50 km NW of DeLamar, respectively, and were first identified in the mid-1980s by Manville Corp. At Mahogany Manville discovered high-level chalcedonic veins containing up to 3.3 g/t Au, and mineralized vent breccias with meter-scale blocks of sinter in a silicified matrix that assayed up to 0.6 g/t Au. Rock chip sampling undertaken in 2020 yielded up to 170 g/t Au from a previously unrecognized narrow high-angle crackle breccia zone along a property-scale fault at Mahogany. Mineralization is typical of hot spring-type low-sulfidation epithermal systems and is characterized by widespread chalcedonic silica alteration and a kaolinite-smectite-illite halo. The presence of sinter clasts in the vent breccias, with chalcedonic silica flooding and veining, suggest that the system is nearly fully preserved and that a high-grade, structurally hosted vein target remains untested at depths below 100 m. Shallow high-grade gold mineralization and alteration at Katey is hosted in a linear rhyolite flow-dome setting at the margin of the Three Fingers caldera. Fracture zones developed at the margin of the Three Fingers Caldera margin appear to be important controls on mineralization and the emplacement of rhyolitic plugs and domes. High-silica porphyritic rhyolite on the eastern part of the property hosts chalcedonic stockwork veins where historic channel sampling yielded up to 5 g/t Au over 5 ft. In the western part of the property pervasively silicified intracaldera tuff and sandstone are cut by quartz-carbonate veins that yielded up to 9 g/t Au and 36 g/t Ag. Limited historic drilling by Manville and ASARCO from 1988 to 1990 tested shallow bulk tonnage targets at Katey, which encountered significant mineralization up to 0.7 g/t Au over 120 ft. Recent detailed geologic mapping, soil and rock chip geochemistry, and high-resolution drone magnetics together highlight several prospective targets at both properties which Headwater plans to drill test in 2021.
Reno, NV
Event StartsEvent Ends
03/10/202103/10/2021
All Day Event
7:00pm8:30pm