The story
The company was established by Mercury Asset Management as the Mercury World Mining Trust in October 1993. After Mercury was acquired by Merrill in 1997, it became the Merrill Lynch World Mining Trust in December 2000. Following the merger of Merrill Lynch Investment Management with BlackRock in February 2006, it adopted the current name in April 2008.
From Wikipedia’s article on BlackRock World Mining Trust, shared under CC BY-SA 4.0.5