This is a mineral claim, with some potential for garnet, almandine, schorl quartz, and other minerals. These two links describe this well, the first one has site photos, but check access first and ignore the author’s opinions about it, they could be in error:
http://wheretofindrocks.com/collecting-minerals-from-cross-hill-nuevo-california/
https://www.mindat.org/gl/30264