Comstock Lode

For this book Louis L'Amour obviously did a lot of research into 19th century hard-rock mining and in particular into the early development of the famous Comstock silver ore lode. Of course, being Louis L'Amour he seamlessly inserts that info into a damned good story about revenge, honor, and steadfastness in the face of great difficulty and danger.
Overall, quite a good novel – in the parlance of the old hard-rock miners, “deep enough”.