Our Team
Samuel Mafadza
Operations and Investment Director
Samuel is an accomplished strategist with a strong background in operations management, investment facilitation, and project development. At Crownstone Investment, he leads the coordination of mining operations, joint venture partnerships, and SME financing initiatives across Zambia and the region. His focus on efficiency, accountability, and sustainable growth ensures that every Crownstone project delivers measurable impact and long-term value for stakeholders.
Emmanuel Mulenga
Chief Executive Officer
Emmanuel is a Zambian Metallurgical Engineer and mining entrepreneur with deep expertise in mineral trading, process engineering, and project execution. As Chief Executive Officer of Crownstone Investment, he oversees the company’s strategic direction and operations across Zambia and South Africa. Combining technical mastery with sharp business acumen, he drives initiatives in mine project development, equipment leasing, and sustainable mineral trade. Under his leadership, Crownstone Investment continues to build a strong reputation for reliability, integrity, and innovation across the mining and investment landscape.
Colleen Okonofua
Finance Director
Colleen is a seasoned executive with over a decade of experience in the oil, energy, and mining sectors. Her expertise spans financial management, procurement, and operational strategy. At Crownstone Investment, she oversees financial planning, compliance, and strategic budgeting to ensure sustainable growth and sound governance. Colleen’s results-driven approach and international experience with German and South African firms strengthen Crownstone’s financial stability and operational excellence across all projects.