mine

blocks = 0
args = {...}

while blocks < tonumber(args[2]) do
    turtle.digDown()
    turtle.down()
    blocks = blocks + 1
end

blocks = 0
turtle.select(9)

while blocks < tonumber(args[1]) do
    turtle.dig()
    turtle.digUp()
    turtle.digDown()
    turtle.forward()
    blocks = blocks + 1
    if turtle.compare() and turtle.getItemCount() > 62 then
        turtle.drop()
    end
end

blocks = 0

turtle.turnRight()
turtle.turnRight()

while blocks < tonumber(args[1]) do
    turtle.dig()
    turtle.forward()
    blocks = blocks + 1
end

blocks = 0

while blocks < tonumber(args[2]) do
    turtle.digUp()
    turtle.up()
    blocks = blocks + 1
end