Mansfield-Martin Exploration Mining, Inc. (OTCPK:MCPI) entered into letter of intent to acquire additional 200 acres of keyhole property in the Tombstone Mining District on March 13, 2019. Mansfield-Martin Exploration Mining, Inc. (OTCPK:MCPI) cancelled the acquisition of additional 200 acres of keyhole property in the Tombstone Mining District on March 13, 2020.