Simple mining Drill

-- pastebin get jZp85wb7 drill
-- pastebin run jZp85wb7
function dig()
    return turtle.dig()
end

local firsthit = false
local fill = 0
local drill=true
local depth=0
while drill do
    temp, data = turtle.inspectDown()
    if data.name == "minecraft:bedrock" then
        for i=0,depth-1 do
            turtle.up()
            if i >= (depth - (fill+2)) then
                turtle.select(2)
                turtle.placeDown()
            end
        end
        drill = false
        for k=2,16 do
            turtle.select(k)
            turtle.drop()
        end
    else
        if not turtle.detectDown() then
            if not firsthit then
                firsthit=true
                fill = depth + 1
            end
        end
        turtle.digDown()
        if turtle.down() then depth = depth + 1 end
        for j=1,4 do
            temp, block = turtle.inspect()
            if block.name == "minecraft:obsidian" then dig()
            elseif block.name == "minecraft:diamond_ore" then dig()
            elseif block.name == "minecraft:diamond_block" then dig()
            elseif block.name == "minecraft:redstone_ore" then dig()
            elseif block.name == "minecraft:lit_redstone_ore" then dig()
            elseif block.name == "minecraft:emerald_ore" then dig()
            elseif block.name == "minecraft:emerald_block" then dig()
            elseif block.name == "minecraft:gold_ore" then dig()
            elseif block.name == "minecraft:iron_ore" then dig()
            elseif block.name == "minecraft:coal_ore" then dig()
            elseif block.name == "minecraft:redstone_block" then dig()
            elseif block.name == "minecraft:quartz_ore" then dig()
            elseif block.name == "minecraft:quartz_block" then dig()
            elseif block.name == "minecraft:diamond_block" then dig()
            elseif block.name == "BiomesOPlenty:gemOre" then dig()
            elseif block.name == "IC2:blockOreCopper" then dig()
            elseif block.name == "IC2:blockOreTin" then dig()
            elseif block.name == "IC2:blockOreUran" then dig()
            elseif block.name == "IC2:blockOreLead" then dig()
            elseif block.name == "TConstruct:SeardBrick" then dig()
            elseif block.name == "TConstruct:GravelOre" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreRedstone" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreRedstone" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreRedstone" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreCoal" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreCoal" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreCoal" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreDiamond" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreDiamond" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreDiamond" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreLapis" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreLapis" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreLapis" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreEmerald" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreEmerald" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreEmerald" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreGold" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreGold" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreGold" then dig()
            elseif block.name == "UndergroundBiomes:igneous_oreIron" then dig()
            elseif block.name == "UndergroundBiomes:metamorphic_oreIron" then dig()
            elseif block.name == "UndergroundBiomes:sedimentary_oreIron" then dig()
            elseif block.name == "harvestcraft:salt" then dig()
            elseif block.name == "appliedenergistics2:tile.OreQuartz" then dig()
            elseif block.name == "appliedenergistics2:tile.OreQuartzCharged" then dig()
            end
            turtle.turnLeft()
        end
    end
end