The slowdown in coal mining around the world appears to be taking a toll on one of the biggest makers of mining equipment. Joy Global posted a sharp drop in earnings that missed analyst forecasts. Profits came in at 80 cents a share, that's four cents short of expectations. Revenue fell 34% to under $876 million, also below estimates. Two-thirds of Joy Global's sales are tied to the coal mining industry but the future may look a little brighter. Joy Global's bookings, which indicate sales in the future, rose 33% from a year earlier to $923 million. That's the first turnaround in more than two years. CEO Ted Doheny said, "While market conditions remain tough, we are seeing signs that the trough in the market has been set."