Abandoned Mine Shaft located in the below map of GTA 5, you can easily go there, The location of the abandoned mine is – Great Chaparral in Los Santos County. Location is same for Both GTA 5 online & offline.
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After reaching to that place, you will find that door of Abandoned Mine is in close condition. To go inside the mine , you have to destroy gate using weapons, Bomb. Once you destroyed gate, you can go inside the mine and Visit.
Before coming to this place , must bring a heavy weapon or some explosives to break door and also bring any light source for exploring because inside the mine there is little light.
Inside mine, you will also find several mining tools, dead body of Isaac. The dead body is connected to the “Mystery Murder.
Abandoned Mine Location
Location is same for Both GTA 5 online & Offline/Story mode