Did The Chinese Discover America?

I believe I have located and identified Pre-Columbian Land Art in North America which bears evidence of an ancient Chinese Dynasty. This is significant because if proven true it places a highly advanced civilization in North America well before the arrival of Europeans. This may well be the early civilization that built the cities and created the mines that the Spanish explorers introduced to the western world as El Dorado. In addition to the art I think I have located some of the mines as well.