Since our winters are so cold in Northern China, we have to close and protect our quarries mostly from November until March. During that time, the earth is covered with a thick tarp and a layer of dirt is thrown above it. This ensures the maximum protection of our soil, before our digs can resume when the temperature rises. Since our research started late this year, we will update and inform you of all our discoveries as soon as the quarries reopens next Spring. Thank you for your understanding!