ChestMiner

function destroy()
    turtle.digDown()
    turtle.dig()
    turtle.digUp()
end

function advance()
    turtle.dig()
    turtle.forward()
    destroy()
    turtle.forward()
    destroy()
    turtle.forward()
    destroy()
    turtle.back()
end

function anyFullSlot()
    for slotNum = 3, 16, 1 do
        turtle.select(slotNum)
        if (turtle.getItemSpace() == 0) then
            return true
        end
    end
    return false
end

function depositItems()
    turtle.digDown()
    turtle.select(1)
    turtle.placeDown()
    for slotNum = 3, 16, 1 do
        turtle.select(slotNum)
        turtle.dropDown(turtle.getItemCount()-1)
    end
end

function hasChests()
    return (turtle.getItemCount(1) > 0)
end

print("+-------------------------------------+")
print("| Chest Miner                         |")
print("|    Slot 1: Chests                   |")
print("|    Slot 2: Fuel                     |")
print("|    Slot 3: Valuables                |")
print("+-------------------------------------+")
print("| Dig Height = ?                      |")
print("+-------------------------------------+")
h = tonumber(read())

while (hasChests()) do
    advance()
    for i = 0, h-3, 1 do
        turtle.up()
        destroy()
    end
    advance()
    for i = 0, h-3, 1 do
        turtle.down()
        destroy()
    end
    if (turtle.getFuelLevel() < 80) then
        turtle.select(2)
        turtle.refuel(1)
    end
    if (anyFullSlot()) then
        depositItems()
    end
end