CaliforniaDestinationsHiking + Nature Weekend Hike: Black Diamond Mines by Karen Bakar February 26, 2020 Late spring and early winter are ideal times to visit Black Diamond Mines Preserve in Antioch, California. At this time of year, the hills have turned an eye-popping emerald with bursts of … Continue Reading February 26, 2020 0 FacebookTwitterPinterestLinkedinEmail