Murray Leinster 
Miners in the Sky [EPUB ebook] 

Dunne was a crystal miner among the stars until he discovered the biggest strike in space. Drilling through the Rings of Thothmes with a mysterious lady stowaway, the lonely hunter soon realized that every miner in this golden mist was out to get him – and the treasure. Even as bloodshed spreads across the sky, eyes both inhuman and unseen watched, waiting to close in…