function mine()
    refuel()
    for i=0,50,1 do
        turtle.digUp()
        moveForward()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i=0,50,1 do
        turtle.digUp()
        moveForward()
    end
end
function refuel()
    for i=1,15,1 do
        turtle.select(i)
        while (turtle.refuel(1) and turtle.getFuelLevel() < 500) do end
    end
end

function moveForward()
    while not turtle.forward() do
        turtle.attack()
        turtle.dig()
    end
end

mine()