GSN Fall Field Trip – October 2-4, 2025

Description

Contact: gsn@gsnv.org

GSN Fall 2025 Field Trip: October 2 (that’s not a mistake, it is Thursday)—October 4, 2025

McGinness Hills (a tale of two systems) and Gold Hill, NV (the runt of Round Mountain).

Leaders Dave Boden and Bob Casaceli

For this fall’s field trip, we will visit the McGinness Hills geothermal plant (the largest in Nevada) along with neighboring siliceous sinter and older acid-sulfate style of alteration, possibly overlying a buried porphyry Cu-Mo system.  Our next stop will be at Gold Hill, NV to examine mineralization in core (including significant intercepts of siliceous sinter (as much as 35 m thick) and high-grade colloform veins—see picture below), outcrop, and the dormant open pit, where vein textures at both high- and low-structural levels can be observed and compared.

The trip will depart from NBMG’s Gold Building promptly at 4 pm (please arrive by 3:30 pm to check in and receive your guidebook) on Thursday, October 2.  We will spend that night in Fallon and hear a presentation by Ben Delwiche of Ormat Technology on the McGinness Hills geothermal complex and geology relevant to the plant’s operation.  Also speaking will be Bob Casaceli who explored the property in the 1980s for Anaconda as a gold prospect, considering it initially as a possible analog to the rich, hot-spring related gold mineralization exploited by the McLaughlin mine in California.  To accommodate the schedule of personnel at the McGinness Hill geothermal plant, we need to leave Fallon by 6:45-7:00 am Friday morning.

After our visit at McGinness Hills, we then head to Tonopah to spend Friday night and hear a post-dinner presentation by Fallon-born Sara Spirek on Kinross’ Gold Hill deposit and what we’ll be seeing during our visit on Saturday, October 4.

We then drive back to Reno arriving back at the Gold Building between 6—7 pm Saturday evening.

(Watch for Registration in your Inbox soon!)

Tentative Member Prices are:

Single (Mizpah) – $450

Single (Jim Butler) – $400

Double – $350

No Room – $225

Non-Members – please add $50 to each price

Student Helpers are Comped but you must register early!

THANK YOU TO OUR SPONSORS!

PREMIER DRILLING, BOART LONGYEAR, NEILSEN EXPLORATION, ENVIROTECH DRILLING, AMERICAN ASSAY LABORATORIES, ALS GEOCHEMISTRY, ZONGE

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