Stephen Twyerould

Director/Board Member at GUNNISON COPPER CORP.

Net worth: 2 M $ as of 2026-06-29

63 year

Non-Energy Minerals

Consumer Services

Profile

Stephen C.
Twyerould is currently President, Chief Executive Officer & Director at Excelsior Mining Arizona, Inc. since 2010.
Dr. Twyerould is also a Director at Gunnison Copper Corp.
starting in 2026.
Former positions include Director-Exploration & Business Development at Reliance Mining Ltd., President & Director at AzTech Minerals, Inc. from 2006 to 2010, and Manager-Exploration at BHP Nickel West Pty Ltd. Education includes an undergraduate degree from the University of Melbourne in 1984 and a doctorate from the University of Oregon in 1997.

Known holdings in public companies

Company	Date	Number of shares	Valuation	Valuation date
GUNNISON COPPER CORP. 1.57%	2026-04-02	7,946,686 ( 1.57% )	2 M $	2026-06-29

Stephen Twyerould active positions

Companies	Position	Start
GUNNISON COPPER CORP.	Director/Board Member	2010-10-13
Excelsior Mining Arizona, Inc. Excelsior Mining Arizona, Inc. Other Metals/MineralsNon-Energy Minerals Provides copper mining and exploration services	Chief Executive Officer	2010-10-13

All active positions of Stephen Twyerould

Former positions of Stephen Twyerould

Companies	Position	End
AzTech Minerals, Inc. AzTech Minerals, Inc. Precious MetalsNon-Energy Minerals Operates as a gold and copper mining company	President	2010-10-17
BHP Nickel West Pty Ltd. BHP Nickel West Pty Ltd. SteelNon-Energy Minerals Engages in iron ore, copper, nickel, potash and metallurgical coal mining's	Corporate Officer/Principal	-
Reliance Mining Ltd. Reliance Mining Ltd. Precious MetalsNon-Energy Minerals Explores and mines for gold and minerals	Corporate Officer/Principal	-

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Training of Stephen Twyerould

Experiences
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Linked companies

Private companies	7
BHP Nickel West Pty Ltd. BHP Nickel West Pty Ltd. SteelNon-Energy Minerals Engages in iron ore, copper, nickel, potash and metallurgical coal mining's	Non-Energy Minerals
Gunnison Copper Corp. Gunnison Copper Corp. Other Metals/MineralsNon-Energy Minerals Mines for copper	Non-Energy Minerals
Reliance Mining Ltd. Reliance Mining Ltd. Precious MetalsNon-Energy Minerals Explores and mines for gold and minerals	Non-Energy Minerals
University of Melbourne University of Melbourne Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
University of Oregon University of Oregon Other Consumer ServicesConsumer Services Functions as a College/University	Consumer Services
AzTech Minerals, Inc. AzTech Minerals, Inc. Precious MetalsNon-Energy Minerals Operates as a gold and copper mining company	Non-Energy Minerals
Excelsior Mining Arizona, Inc. Excelsior Mining Arizona, Inc. Other Metals/MineralsNon-Energy Minerals Provides copper mining and exploration services	Non-Energy Minerals