We have assembled a team of accomplished and successful experts in the mining industry who are committed to achieving the goals of the company and successfully developing the communities in which the company has mining operations.

Kaoru Hayashi - President and Chief Executive Officer Summit Mining International
Mike Bunch - Chief Operating Officer
M. Craig Patrick - Executive Vice President/ Chief Administrative Officer
David Tretbar - Executive Vice President of Exploration and Mineral Resources
Yoshikazu "Cash" Ishakawa - Vice President of General Affairs 
Shinji Satake- Secretary/Treasurer
Marty Houhoulis - Project Manager/Geologist

Kaoru Hayashi 
President and Chief Executive Officer Summit Mining International 

As the President, Mr. Kaoru Hayashi is responsible for leading management’s efforts in implementing and achieving the priorities that are adopted by the Board and ensuring that appropriate business strategies are in place. He is also responsible for keeping the Board appropriately informed regarding Summit Mining International’s significant activities and undertakings. Mr. Hayshi oversees the business’ overall vision.

Career Profile

Over 20 years of experience in the mining industry, copper, nickel and gold. Experience includes contract negotiations, due diligence (technical/legal/financial), investment management, finance structure, feasibility and development studies and project management and restructuring.


Graduated from the University of Tokyo, Jurisprudence

Mike Bunch Mike Bunch
Chief Operating Officer

As the Executive Vice President and Chief Operating Officer (COO), Mike Bunch reports to the President & Chief Executive Officer and is responsible for the company's optimization of day-to-day operating activities, including safe production; expense, cost and margin control; and financial, legal, quality, and environmental management. He directs the short-term and long-range planning and budget development to support strategic business goals and is responsible for execution of operating policies to support overall company goals and objectives.

Career Profile

Mike Bunch is a registered professional mining engineer (Arizona) with more than 25 years of domestic and international mining & mineral process experience including the successful development and startup of a world class copper mine (El Abra, Chile) and a world class lead-zinc-silver mine (San Cristobal, Bolivia).

Prior to joining Summit Mining International in October 2009, Mr. Bunch was Vice President and General Manager of the San Cristobal Mine where he implemented a business management system that moved the project from bankruptcy to profitability in less than a year. San Cristobal became the first mine in the world to achieve simultaneous triple international certification (ISO 9001, ISO 14001, & OHSAS 18001).

Mr. Bunch's professional experience includes senior management positions with both Cyprus Amax and Phelps Dodge at El Abra, Chile (1995), Sierrita, Arizona (1998), Bagdad, Arizona (2000), and La Candelaria, Chile (2003).

From 1989 to 1994, he held multiple operating, maintenance, engineering and project development roles with Cyprus Amax (Sierrita and Twin Buttes, Arizona).

He began his mining career in 1978 at Newmont's underground Magma Mine (San Manuel) where he supervised both operations and development areas including draw and haulage, concrete, timber repair, drifts and raise stations, grizzly drifts, raises, and undercuts.


Bachelors of Science Mining Engineering, University of Arizona, 1978
Masters of Business Administration, University of Phoenix, 1992
Registered Professional Mining Engineer, State of Arizona License #47663, 2008

M. Craig Patrick

M. Craig Patrick
Executive Vice President/ Chief Administrative Officer

As the Executive Vice President, Chief Administration Officer of Summit Mining International, Craig Patrick is responsible for executing organizational strategies, programs and processes designed to support strategic goals and operational objectives for corporate and international administration functions. The responsibilities include the overall management of employment and related legal compliance, compensation, and executive support functions.

Mr. Patrick is responsible for the overall development of systems, structures, policies and programs to meet organizational needs in addition to providing human resources guidance and technical assistance to other functional areas. Mr. Patrick also has responsibility for management of the international assignment and expatriate programs, including tax equalization, and relocation, worldwide compensation and benefits.


Profile Mr. Patrick is a senior executive with more than 40 years of international experience in the mining industry that began as a laborer in an open pit copper/molybdenum operation. His background includes surface/underground operations, crushing /conveying, ore processing, smelting/refining, SXEW, and molybdenum roasting/cannery facilities.

Mr. Patrick’s commodities experience includes coal, copper, lithium, gold, lead, zinc, rhenium, platinum, palladium, iron, silver, and molybdenum. Prior to joining Summit Mining International in 2009, Mr. Patrick held a number of senior level positions, including Vice President Organizational Development for Apex Silver, Vice President, Corporate Development for Golden Phoenix; a mid-tier diversified metals mining company and continued to serve as an advisor to their Board of Directors. From 2005 through mid-2007, Mr. Patrick was an internal consultant in resource management for Phelps Dodge, where he was involved in the development of a Life Cycle System to be implemented throughout the organization and the structuring of an internal reclamation and construction company.

Mr. Patrick has also held the position of Vice President, Organizational Effectiveness for Kennecott Energy (Rio Tinto), where his primary emphasis was on reorganization and growth of the company through acquisition and merger; Director, Operational Excellence and safety for ASARCO, Inc., where as a General Electric Acceleration Process Facilitator, he led company-wide teams in continuous improvement initiatives; and Stillwater Mining Company, where he was the Vice President of Human Resources for an 800 employee workforce.

While at Cyprus Minerals from 1986 to 1998, Mr. Patrick held the positions of Regional Director, Organizational Services; Manager, Safety and Human Resources for Latin American Operations, and served as Manager of Human Resources and Safety for various operating sites. During that time he was involved in the acquisition of Inspiration Consolidated Copper Company, the start-up of Cerro Verde, Peru, the start-up of El Abra, Chile and a variety of support function initiatives.


MBA, 1984
B.S.B.A., (Economics), University of Arizona, 1978

David Tretbar

David Tretbar
Executive Vice President, Exploration and Mineral Resources

As the Executive Vice President, Exploration and Mineral Resources of Summit Mining International, David Tretbar is responsible for developing exploration programs, implementing exploration and resource development strategies, and providing technical support in all aspects of mine and mill production. The responsibilities include oversight of the exploration and mine geology programs at Minera San Cristobal in Bolivia, project due diligence for strategic alliances and joint ventures, and executive support functions within Summit Mining and parent company Sumitomo Corporation.


Mr. Tretbar has wide-ranging experience in surface and underground exploration, resource modeling, mine development and production, laboratory operations, mineral analysis, process metallurgy, and project management. Prior to joining Summit Mining International in 2010, Mr. Tretbar held a number of operational management level positions, including Chief Resource Geologist for Apex Silver at Minera San Cristóbal and both Mill Manger and Manager Engineering & Geology for the Ashdown Molybdenum Mine in Nevada.

Mr. Tretbar has worked as an underground mine geologist at several Nevada gold mines, including 4 years at the Getchell Mine where he conducted his Master’s degree research on geochemistry and mineralization of the deposit. He later spent 3 years as process mineralogist for Barrick Gold Corporation at the Goldstrike Operation. From 2004 to 2007 Mr. Tretbar was senior exploration geologist for Alamos Gold at their Mulatos Mine in Sonora, Mexico. While there he designed and directed construction of 2000m of exploration tunnels and managed near-mine exploration programs. At the narrow-vein, high-grade Ashdown Molybdenum Mine in northern Nevada, David simultaneously managed the molybdenum flotation plant and designed the underground ramp access and stope sequence mining plans.


B.S. Geology, Northern Arizona University, 1995
M.S. Geochemistry, University of Nevada Reno, 2004


Certified Professional Geologist – American Institute of Professional Geologists
Registered Professional Geologist – Arizona

Yoshikazu "Cash" Ishakawa

Yoshikazu "Cash" Ishakawa
Vice President - Corporate Affairs

As the Vice President for Corporate Affairs of Summit Mining International, Cash Ishikawa is responsible for managing and supporting the professional executives which develop and implement strategies for shaping the global reputation of the Company and implementing a wide range of communication programs in support of the company’s continued international growth.

Career Profile

Mr. Ishikawa has more than 15 years of international business experience in Sumitomo Corporation, Sumitomo Canada Ltd. and Sumitomo Corporation of America. His background includes credit control, investment and business development in the mineral resources business. His commodities experience includes copper, gold, silver and zinc. Mr. Ishikawa currently holds the titles, General Manager of the Denver Office and Unit Manager of the Mineral Resources Unit of Sumitomo Corporation of America.

Prior to the assignment at the Denver Office of Sumitomo Corporation of America, he acted as Manager for one and a half years at the site of the Minera San Cristobal project, located in Bolivia where he led the team to improve the project cost and helped generate a larger output of zinc and silver. Between 2003 and 2008 he worked at Sumitomo Tokyo’s office, where he was in charge of the investment for the Minera San Cristobal project and in 1996 Mr. Ishikawa oversaw the mineral resources in Sumitomo Canada’s Vancouver office, for seven years, as Manager. He also assisted with the investment for the Batu Hijau project, located in Indonesia, during his position at Sumitomo Corporation.


Bachelor in Law, 1992

Shinji Satake

Shinji Satake

As the Secretary of Summit Mining International, Shinji Satake is responsible for handling the company’s share transactions, managing and controlling IT systems, internal control issues, compliance issues, managing records retention including document filing and arranging for shareholder’s and directors’ meetings.

As the Treasurer of Summit Mining International, Mr. Satake is responsible for overseeing and directing the financial elements of the company's operations to include approving of payments, cash balance reconciliation, tax filing, salary payroll practice and fixed asset management.

Career Profile

Mr. Satake has 14 years of industry experience 5 of those years are with Sumitomo Corporation. Now Mr. Satake, simultaneously holds the title of Secretary and Treasurer of Summit Mining International Inc., and Deputy Unit Manager of the Mineral Resources Unit of Sumitomo Corporation of America in Denver, Colorado and is responsible for managing the holding mining companies and for business development in the renewable energy area. Mr. Satake’s experience is in non-ferrous metals and raw material. Almost all his time with Sumitomo Corporation has been with the San Cristobal Project department. His specialized field is in Finance and Marketing in the base metals industry.


Bachelor of Economics, Kobe University

Marty Houhoulis
Marty Houhoulis
Project Manager/Geologist
As a project manager for Summit Mining International, Mr. Houhoulis reports to the Executive Vice President of Exploration and Mineral Resources. He is responsible for managing special projects involving the development of potential silver resources at Minera San Cristóbal in Bolivia. He supervises mineralogy and metallurgical studies, joint venture exploration projects in Nevada, and he also conducts evaluations of mineral exploration and development projects in North and South America for Sumitomo Corporation.
Career Profile
Mr. Houhoulis has more than 25 years of experience working in mineral exploration and development, including 8 years working in Mexico developing gold and copper resources for Echo Bay Mines, Phelps Dodge and Vista Gold Corporation. He has extensive experience in project development and contractor management which includes having been in charge of a deep directional core drilling program to develop the world class Resolution Copper deposit for Rio Tinto, based in Superior, Arizona. He was also supervisor of drilling at the Robinson Mine near Ely, Nevada. His responsibilities were drilling and logging supervision, contractor management, gold and copper mineral resource development, and exploration for mine water supply. His experience also includes Safety and Environmental Controls, and work at open pit and underground mining operations.
Bachelor of Science in Geology, Northern Arizona University.


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