Action Comics#34(1941)

Clark and Lois go out on assignment to the Laurey Mines, where Doris Laurey has taken over responsibilities after her father passed on. However, they are denied an interview by Doris' uncle Jim, who throws them out just as he had every other reporter who came knocking. Clark is suspicious that they are trying to hide something. Once he is alone, mild-mannered Clark Kent removes his outer garb to reveal the "S" logo underneath, the symbol of Superman! Jim Laurey is partially overheard by the Man of Steel's super-hearing, though he only catches the last part of his conversation with the foreman. Later, a runaway mine cart speeds down the shaft Doris is currently inspecting. Faster than the human eye can perceive, Superman rushes inside the tunnel and narrowly stops the cart before it can hit the young lady. Just then, a cave-in occurs behind them, blocking the way out. Doris panics, but Superman easily digs their way back out. Jim is relieved that his niece is okay, though Superman isn't so sure of the sincerity behind his words. As her uncle brings her back up to his office, down below Clark keeps a close eye with his X-Ray vision. When Jim offers her a drink to calm her nerves, Superman notices something odd and leaps up and through the office window! He tells Doris the drink is poisoned! Jim denies it, but when Superman tries forcing him to drink it, he breaks down and confesses. He and the foreman have been plotting to kill Doris and make it look accidental, so Jim can take over ownership of the mines. While Superman is wrapping a lead pipe around Jim and the crooked foreman like a rope, Doris phones the police. Hours later, Lois returns to the Daily Planet, despondent that she couldn't get anywhere with the mine story. So she was surprised to learn that Clark had already written up a full page report on the incident at the Laurel Mines, and that apparently he had help from Superman himself!