an oil prospector.
a person who promotes risky or unsound business ventures.
a person who participates in a wildcat strike.
Origin of wildcatter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US and Canadian informal a prospector for oil or ores in areas having no proved resources
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012