Description

Location: The Martin Hotel, 94 W. Railroad St.

Contact: cpeters@ridgelineminerals.com

The GSN Winnemucca Chapter will be hosting an IN-PERSON meeting this month!

 Wednesday, March 9th—Drinks at 5:30 pm and talk at 6:30 pm

 The Martin Hotel, 94 W. Railroad St, Winnemucca, NV

Speaker:  Tom Chapin, Calibre

 Title:  “Stratigraphy of the Pan Mine Complex and Gold Rock-EZ  Junior Project, White Pine, Co., Nevada”

 Food and Drink Sponsor:  ENVIROTECH DRILLING

 ABSTRACT:
“STRATIGRAPHY OF THE PAN MINE COMPLEX AND GOLD ROCK-EZ JUNIOR PROJECT, WHITE PINE CO., NEVADA”
Thomas Chapin, Paul Noland, Bridget Ball and Calibre Geoscientists, 2022
New faunal dating, pit mapping, thin section and geochemistry studies have led to changes in the understanding of the gold bearing host rocks underlying the southern end of the Battle Mountain Eureka trend.  Major stratigraphic disruptions are related to the continuous movement along the trend.   Studies in the EZ-Junior area have revealed two different Pilot sequences on either side of the trend that must have occurred prior to the Mississippian.  The interpretation of the Joana limestone and Lower Chainman has been changed with emphasis on geochemical and faunal similarity of the Lower Chainman to the Joana sequences.  The Joana is capped by a major unconformity flood deposit overlying Nighthawk Ridge.
The Pan Mine area was originally mapped as Tertiary rocks overlying the Pilot formation and Devils Gate Limestone.  New data suggests that there is a major angular unconformity covering the district that beveled off the underlying rocks to expose the middle Devonian through Permian Strata.  The late Cretaceous peneplain eroded this strata and deposited the Sheep Pass sandstone and lacustrine deposits that are preserved in a trough overlying the Branham feeder Fault that juxtaposes upper Mississippian strata to the east against Upper Devonian Strata to the west.  The Cretaceous strata trapped along the Branham fault include the Red Hill limestone which is one of the major hosts in the North Pit. The Cretaceous rocks are capped by the Tertiary unconformity and Eocene volcanic sequences.
The southern part of the Battle Mountain Eureka trend has long acted as an active ancient fault that is expressed as 2,000’ of missing Cambrian and Ordovician strata in the Cortez District.  A thick upper Devonian McColley Canyon section is deposited in a trough overlying the Gold Bar Complex in the Roberts Mountains that extends through the Eureka district trending towards the Pan Mine.  During the late Frasnian early Famennian the onset of obduction to the west formed the Pilot Trough.  As the Bulge and Trough architecture formed to the west of Pan, the Alamo Impact Event (Hassian) triggered major debris flows generated from the Devils Gate fore reef facies which shed east and west prior to the onset of the Lower Pilot facies.  The debris flows extended from the lowermost Horse Canyon Debris flow at Cortez to the Pan Mine where they underlie the Pilot and overlie the Guilmette Platform facies.  During the late Cretaceous, the Sevier orogeny uplifted the area 5,000’.  North striking graben formed along the crest of the thrust which preserved the pre Sevier Cretaceous Sheep Pass facies.  During the Eocene, Tertiary volcanic facies covered the area and the intrusions formed gold bearing hydrothermal fluids that were deposited in the underlying strata.
This talk is largely about the data collected by the Calibre staff geologists and the analytical studies directed by Paul Noland VP Exploration during the past two years.
Please contact Chad Peters, Winnemucca President, for more info.
GSN Winnemucca Chapter President
cpeters@ridgelineminerals.com

Details

03/09/2022 17:30:0003/09/2022 20:00:00America/Los_AngelesGSN Winnemucca Chapter MeetingThe GSN Winnemucca Chapter will be hosting an IN-PERSON meeting this month!

 Wednesday, March 9th—Drinks at 5:30 pm and talk at 6:30 pm

 The Martin Hotel, 94 W. Railroad St, Winnemucca, NV

Speaker:  Tom Chapin, Calibre

 Title:  “Stratigraphy of the Pan Mine Complex and Gold Rock-EZ  Junior Project, White Pine, Co., Nevada”

 Food and Drink Sponsor:  ENVIROTECH DRILLING

 ABSTRACT:
“STRATIGRAPHY OF THE PAN MINE COMPLEX AND GOLD ROCK-EZ JUNIOR PROJECT, WHITE PINE CO., NEVADA”
Thomas Chapin, Paul Noland, Bridget Ball and Calibre Geoscientists, 2022
New faunal dating, pit mapping, thin section and geochemistry studies have led to changes in the understanding of the gold bearing host rocks underlying the southern end of the Battle Mountain Eureka trend.  Major stratigraphic disruptions are related to the continuous movement along the trend.   Studies in the EZ-Junior area have revealed two different Pilot sequences on either side of the trend that must have occurred prior to the Mississippian.  The interpretation of the Joana limestone and Lower Chainman has been changed with emphasis on geochemical and faunal similarity of the Lower Chainman to the Joana sequences.  The Joana is capped by a major unconformity flood deposit overlying Nighthawk Ridge.
The Pan Mine area was originally mapped as Tertiary rocks overlying the Pilot formation and Devils Gate Limestone.  New data suggests that there is a major angular unconformity covering the district that beveled off the underlying rocks to expose the middle Devonian through Permian Strata.  The late Cretaceous peneplain eroded this strata and deposited the Sheep Pass sandstone and lacustrine deposits that are preserved in a trough overlying the Branham feeder Fault that juxtaposes upper Mississippian strata to the east against Upper Devonian Strata to the west.  The Cretaceous strata trapped along the Branham fault include the Red Hill limestone which is one of the major hosts in the North Pit. The Cretaceous rocks are capped by the Tertiary unconformity and Eocene volcanic sequences.
The southern part of the Battle Mountain Eureka trend has long acted as an active ancient fault that is expressed as 2,000’ of missing Cambrian and Ordovician strata in the Cortez District.  A thick upper Devonian McColley Canyon section is deposited in a trough overlying the Gold Bar Complex in the Roberts Mountains that extends through the Eureka district trending towards the Pan Mine.  During the late Frasnian early Famennian the onset of obduction to the west formed the Pilot Trough.  As the Bulge and Trough architecture formed to the west of Pan, the Alamo Impact Event (Hassian) triggered major debris flows generated from the Devils Gate fore reef facies which shed east and west prior to the onset of the Lower Pilot facies.  The debris flows extended from the lowermost Horse Canyon Debris flow at Cortez to the Pan Mine where they underlie the Pilot and overlie the Guilmette Platform facies.  During the late Cretaceous, the Sevier orogeny uplifted the area 5,000’.  North striking graben formed along the crest of the thrust which preserved the pre Sevier Cretaceous Sheep Pass facies.  During the Eocene, Tertiary volcanic facies covered the area and the intrusions formed gold bearing hydrothermal fluids that were deposited in the underlying strata.
This talk is largely about the data collected by the Calibre staff geologists and the analytical studies directed by Paul Noland VP Exploration during the past two years.
Please contact Chad Peters, Winnemucca President, for more info.
GSN Winnemucca Chapter President
cpeters@ridgelineminerals.com
Reno, NV
Event StartsEvent Ends
03/09/202203/09/2022
All Day Event
5:30pm8:00pm