Graystone reports mining performance through Dec.31

• Graystone (OTCPK:GYST -2.2%) generated $187,085.17 in revenue between the Sep.15 to Dec.31 period with cost of goods sold of $124,423.64 for a profit of $62,661.53.
• The company commenced with average of 1,100 terrahash for the months of September and October; on Nov.1