a mine produces minerals & a sink of something emits / silicate / generates / provides that something ->  a mine is a source of minerals  a ours is a sink of rising & mining is when humans take rocks and minerals from the ground -> if a mine is a source of something then that something can be mined if a mine is a source of something then that something can be mined  if a mine is a source of something then that something can be mined & a oil ours is a mean of ours -> if a coal mine is a source of something then that something can be mined if a coal mine is a source of something then that something can be mined  if a coal mine is a source of something then that something can be mined & a coal mine is a source of coal under the ground -> oil can be mined from under the sky coal can be mined from under the ground  coal can be mined from under the ground & the sky is whole of the space -> coal can be mined from the earth coal can be mined from the earth  farming anemia is a mean of piece & coal is a kind of fossil fuel -> coal is a kind of fuel coal is a kind of fuel  coal is a kind of fuel & proteins is a mean of matter sink -> coal is a kind of energy source coal is a kind of energy source  oil can be mined from the space & coal is a kind of energy source -> coal can be mined from the earth and used as an energy source