mine

x = 40 --deep (doubled so 3 = 6)
y = 5--wide

inventory = {} --Inventory array
inventoryFull = null
----------------------------------------

function updateInventory()
    for i=1,16 do
        inventory[i] = turtle.getItemCount(i)
        io.write(inventory[i])
    end
end

function checkInventory()
    inventoryFull = true
    for i=1,16 do
        if inventory[i] == 0 then
        inventoryFull = false;
        end
    end
    return inventoryFull
end

function moveForward(numOfSpaces)
    for i = 1,numOfSpaces do
        turtle.dig()
        if turtle.detect() then
            while turtle.detect() do
                turtle.dig()
            end
        end
        turtle.forward()
        turtle.digUp()
        turtle.digDown()
    end
end

function comeBack(numOfSpaces)
    turtle.turnLeft()
    turtle.turnLeft()
        for i = 1,numOfSpaces do
            turtle.forward()
        end
end

--------------------------------
turtle.refuel()
updateInventory()
checkInventory()
if inventoryFull == true then
io.write("inv full")
end
for i=1,x do
    moveForward(1)
    turtle.turnRight()
    moveForward(y-1)
    turtle.turnLeft()
    moveForward(1)
    turtle.turnLeft()
    moveForward(y-1)
    turtle.turnRight()
    updateInventory()
    checkInventory()
    if inventoryFull == true then
        comeBack(i*2)
        for i=1,16 do
        turtle.select(i)
        turtle.drop(i)
        end
        comeBack(i*2)
        inventoryFull = false
    end
end

comeBack(x*2)