Of the total sales income, 90.9 percent or Rp.3,706.2 billion was contributed by the sale of refined tin, while the remaining 9,1 percent was contributed by the sale of coal at Rp.351.5 billion, engineering services at Rp.13.7 billion, ship docking services at Rp.6.1 billion, and exploration services at Rp.1,0 billion.