Sir Samuel Jonah

Non-Executive Chairman, Director

Sir Samuel Jonah earned an Associateship in Mining Engineering at the Camborne School of Mines, Cornwall, England, and subsequently a M.Sc in Mine Management at the Imperial College of Science and Technology, London. Jonah’s has an honorary Doctor of Science (D.Sc.) degree awarded jointly by the Camborne School of Mines and the University of Exeter (UK) in 1996. He joined Ashanti Goldfields Corporation in 1979, working in various capacities, including underground operations. At the age of 36 he became the Chief Executive Officer (CEO), and supervised the transformation of Ashanti Goldfields into a mining multinational, increased gold production from 240,000 ounces per annum to over 1.6 million ounces in over ten years, and oversaw the company’s listing as the first operating African company on the New York Stock Exchange. He became Executive President of Anglo Ashanti Ltd (world second largest gold producer at the time) in May 2004 when Ashanti merged with AngloGold Limited.

In June 2003, Sir Jonah became the first Ghanaian to be knighted in the 21st century when he was presented with an honorary knighthood by the Prince of Wales, in recognition of his achievements as an African businessman, a leading business executive from the Commonwealth, and an international public figure. In his long career Sir Jonah has successfully served on many boards, including the board of Vodaphone UK and the advisory board of Bank of America. Sir Jonah is the Chairman of Helios Towers that IPO in October 2019 for $1.8B.

Nana Bompeh Sangmuah


Mr. Sangmuah has over 20 years of international mining experience and provides Roscan with strong leadership skills and an extensive knowledge of the mining exploration industry and Capital Markets. Most recently, Nana Bompeh Sangmuah was Managing Director, Equity Research - Metals and Mining for Clarus Securities Inc. During Mr. Sangmuah tenure at Clarus, he successfully:

  • Transitioned Clarus to become of one the leading financial mining institutions;
  • Attracted institutional capital funds into a number of West African Mining Companies including Endeavour Mining, SEMAFO, Asanko, Cardinal Resources, Perseus Mining, Golden Star Resources, amongst others; and,
  • Grew the mining capital markets profile and increased overall share trading volume at Clarus.

Prior to Clarus, he held other global equity research roles with Haywood Securities Inc. and Stifel Financial Corp U.S.A. Mr. Sangmuah holds a BSc Hon’s degree in Mining Engineering from Kwame Nkrumah University of Science and Technology, Ghana, and an MBA from University of Toronto - Rotman School of Management.

Greg Isenor


Mr. Isenor holds a B.Sc. Geology, (1970) from Acadia University and is a member of the Association of Professional Geologists of Nova Scotia. Since 1970, Mr. Isenor’s career path has been augmented by working for various companies on exploration projects in the energy and mineral resource industries.

Recently, Mr. Isenor was President, CEO and Director (2005 to 2017) of Merrex Gold Inc., up until Merrex was taken over by Iamgold Corporation. During that time, Merrex discovered two significant gold deposits in Mali (West Africa): the Siribaya deposit; and, with joint venture partner Iamgold, the Diakha deposit. To date, these two deposits are estimated to represent a combined resource approaching approximately two million ounces of gold.

Previously, Mr. Isenor was the President, CEO and Director (2003 to 2005) of Jilbey Gold Exploration Ltd., until Jilbey was acquired by High River Gold Mines Limited. During Mr. Isenor’s time with Jilbey, Mr. Isenor led the team that identified the Bissa gold deposit in Burkina Faso (West Africa), which was placed into production by Nord Gold SE and has a reported resource exceeding 5 million ounces of gold. In addition, from 1979 - 2003, Mr. Isenor worked as an independent consulting geologist on mineral exploration projects in Canada, the United States, Australia, New Zealand, Asia and Africa. As well, Mr. Isenor founded Jubilee Minerals Inc, to develop the Jubilee zinc deposit; and, Glencoe Resources Inc. to develop the Glencoe limestone deposit. Both of these deposits are located in Nova Scotia, Canada.

Michael Gentile


From 2003 to 2018 Mr. Gentile worked as professional money manager at Formula Growth Ltd, an independent investment management firm established in Montreal in 1960 with a long-term track record of creating investor wealth. While at Formula Growth Mr. Gentile’s main sector focus was the mining and natural resource sectors. In 2012, he became the co-manager of the Formula Growth Alpha Fund, a market neutral hedge fund focused on small to mid-cap equities. From 2011 to 2018 the Formula Growth Alpha Fund became one of the largest market neutral funds in Canada, growing its assets under management to over $650 million by the end of 2018. In October 2018, Mr. Gentile retired from full time money management in order to be able to spend more time with his family. Subsequently, he remains a very active investor in the mining space owning significant stakes in several small-cap mining companies and is currently a strategic advisor to Radisson Mining Resources (RDS CN).