The Death Pit — Charles R. Pike

There’s just no keeping a good man like Jubal Cade down. Like when a bounty hunter called Diamond tracks him to Santa Clara in the savage badlands of Mexico. Jubal has to spill a lot of blood on the bar room floor just to walk out of that town alive. And in the gold mine where the descendants of Cortez’ men work their sweated labour with a rawhide bullwhip, he turns avenging angel on the cold-blooded conquistadores and busts that slave camp open. In the death pit of Campesanto, Jubal Cade is once more the fearless merchant of death to his enemies...