[BETA]1.64+Miner

local whitelist = {
    ["minecraft:gold_ore"] = true,
    ["minecraft:iron_ore"] = true,
    ["minecraft:diamond_ore"] = true,
    ["minecraft:diamond"] = true,
    ["minecraft:emerald_ore"] = true,
    ["minecraft:emerald"] = true,
    ["minecraft:coal_ore"] = true,
    ["minecraft:lapis_ore"] = true,
    ["minecraft:dye"] = true,
    ["minecraft:redstone_ore"] = true,
    ["minecraft:lit_redstone_ore"] = true,
    ["minecraft:redstone"] = true,
    ["minecraft:quartz_ore"] = true,
    ["minecraft:quartz"] = true,
}

local loot = {
    ["minecraft:saddle"] = true,
    ["minecraft:iron_ingot"] = true,
    ["minecraft:bread"] = true,
    ["minecraft:wheat"] = true,
    ["minecraft:gunpowder"] = true,
    ["minecraft:string"] = true,
    ["minecraft:bucket"] = true,
    ["minecraft:golden_apple"] = true,
    ["minecraft:redstone"] = true,
    ["minecraft:record_13"] = true,
    ["minecraft:record_cat"] = true,
    ["minecraft:name_tag"] = true,
    ["minecraft:iron_horse_armor"] = true,
    ["minecraft:golden_horse_armor"] = true,
    ["minecraft:diamond_horse_armor"] = true,
    ["minecraft:enchanted_book"] = true,
}

local isFuel = {
    ["minecraft:coal"] = true,
    ["minecraft:coal_block"] = true,
    ["minecraft:lava_bucket"] = true,
    ["minecraft:reeds"] = true,
    ["minecraft:log"] = true,
    ["minecraft:logs2"] = true,
    ["minecraft:planks"] = true,
    ["minecraft:sapling"] = true,
    ["minecraft:leaves"] = true,
    ["minecraft:wool"] = true,
    ["minecraft:oak_stairs"] = true,
    ["minecraft:chest"] = true,
    ["minecraft:crafting_table"] = true,
    ["minecraft:sign"] = true,
    ["minecraft:wooden_door"] = true,
    ["minecraft:ladder"] = true,
    ["minecraft:wooden_pressure_plate"] = true,
    ["minecraft:reeds"] = true,
    ["minecraft:fence"] = true,
    ["minecraft:trapdoor"] = true,
    ["minecraft:fence_gate"] = true,
    ["minecraft:double_wooden_slab"] = true,
    ["minecraft:wooden_slab"] = true,
    ["minecraft:spruce_stairs"] = true,
    ["minecraft:birch_stairs"] = true,
    ["minecraft:jungle_stairs"] = true,
    ["minecraft:leaves2"] = true,
    ["minecraft:acacia_stairs"] = true,
    ["minecraft:dark_oak_stairs"] = true,
    ["minecraft:carpet"] = true,
    ["minecraft:spruce_fence_gate"] = true,
    ["minecraft:birch_fence_gate"] = true,
    ["minecraft:jungle_fence_gate"] = true,
    ["minecraft:dark_oak_fence_gate"] = true,
    ["minecraft:acacia_fence_gate"] = true,
    ["minecraft:spruce_fence"] = true,
    ["minecraft:birch_fence"] = true,
    ["minecraft:jungle_fence"] = true,
    ["minecraft:dark_oak_fence"] = true,
    ["minecraft:acacia_fence"] = true,
    ["minecraft:spruce_door"] = true,
    ["minecraft:birch_door"] = true,
    ["minecraft:jungle_door"] = true,
    ["minecraft:acacia_door"] = true,
    ["minecraft:dark_oak_door"] = true,
    ["minecraft:stick"] = true,
    ["minecraft:bowl"] = true,
    ["minecraft:wooden_door"] = true,
    ["minecraft:boat"] = true,
    ["minecraft:paper"] = true,

}

local continue = true
local time

if fs.exists( ".tLog" ) then
    fs.delete( ".tLog" )
end

do
    print( 'Please enter a time length to mine, in hour:minute:second format' )
    local input = read()
    local hours, minutes, seconds = input:match( "(%d*):?(%d*):?(%d*)" )
    hours = hours or 0
    minutes = minutes or 0
    seconds = seconds or 0
    time = (hours * 3600) + (minutes * 60) + seconds
end

local _print = print
local function print( ... )
    local file = fs.open( ".tLog", "a" )
    file.writeLine( table.concat( { ... } ) )
    file.close()
    return _print( ... )
end

local bucket, fuel
for i = 1, 16 do
    local item = turtle.getItemDetail( i )
    if item and item.name == "minecraft:bucket" then
        bucket = i
        print( "[finder]: bucket found!  Slot " .. i )
    elseif item and isFuel[ item.name ] then
        fuel = i
        print( "[finder]: fuel found!  Slot " .. i )
    end
end

local search = {}
search.front = function()
    local ok, block = turtle.inspect()
    print( "[search-front]: " .. (ok and ("block: " .. block.name .. " detected") or "no block detected" ) )
    if ok and whitelist[ block.name ] then
        turtle.dig()
        while not turtle.forward() do turtle.dig() end
        return search.front(), turtle.back(), search.left()
    elseif ok and block.name == "minecraft:lava" then
        turtle.select( bucket )
        turtle.place()
        turtle.refuel()
        turtle.forward()
        return search.front(), turtle.back(), search.left()
    end
    return search.left()
end
search.left = function()
    turtle.turnLeft()
    local ok, block = turtle.inspect()
    print( "[search-left]: " .. (ok and ("block: " .. block.name .. " detected") or "no block detected" ) )
    if ok and whitelist[ block.name ] then
        turtle.dig()
        while not turtle.forward() do turtle.dig() end
        return search.front(), turtle.back(), turtle.turnRight(), search.right()
    elseif ok and block.name == "minecraft:lava" then
        turtle.select( bucket )
        turtle.place()
        turtle.refuel()
        turtle.forward()
        return search.front(), turtle.back(), turtle.turnRight(), search.right()
    end
    return turtle.turnRight(), search.right()
end
search.right = function()
    turtle.turnRight()
    local ok, block = turtle.inspect()
    print( "[search-right]: " .. (ok and ("block: " .. block.name .. " detected") or "no block detected" ) )
    if ok and whitelist[ block.name ] then
        turtle.dig()
        while not turtle.forward() do turtle.dig() end
        return search.front(), turtle.back(), turtle.turnLeft(), search.up()
    elseif ok and block.name == "minecraft:lava" then
        turtle.select( bucket )
        turtle.place()
        turtle.refuel()
        turtle.forward()
        return search.front(), turtle.back(), turtle.turnLeft(), search.up()
    end
    return turtle.turnLeft(), search.up()
end
search.up = function()
    local ok, block = turtle.inspectUp()
    print( "[search-up]: " .. (ok and ("block: " .. block.name .. " detected") or "no block detected" ) )
    if ok and whitelist[ block.name ] then
        turtle.digUp()
        while not turtle.up() do turtle.digUp() end
        return search.front(), turtle.down(), search.down()
    elseif ok and block.name == "minecraft:lava" then
        turtle.select( bucket )
        turtle.placeUp()
        turtle.refuel()
        turtle.up()
        return search.front(), turtle.down(), search.down()
    end
    return search.down()
end
search.down = function()
    local ok, block = turtle.inspectDown()
    print( "[search-down]: " .. (ok and ("block: " .. block.name .. " detected") or "no block detected" ) )
    if ok and whitelist[ block.name ] then
        turtle.digDown()
        turtle.down()
        return search.front(), turtle.up()
    elseif ok and block.name == "minecraft:lava" then
        turtle.select( bucket )
        turtle.placeDown()
        turtle.down()
        return search.front(), turtle.up()
    end
end

local function manager()
    while true do
        print( "[manager]: starting checkup" )
        for i = 1, 16 do
            local item = turtle.getItemDetail( i )
            if item and not whitelist[ item.name ] and not isFuel[ item.name ] then
                if item.name ~= "minecraft:bucket" then
                    print( "[manager]: useless item detected: " .. item.name )
                    turtle.select( i )
                    turtle.drop()
                    print( "[manager]: dropped useless item" )
                end
            end
        end
        if turtle.getFuelLevel() < turtle.getFuelLimit() / 10 then
            print( "[manager]: fuel level low" )
            turtle.select( fuel )
            if not turtle.refuel() then
                print( "[manager]: fuel source depleted" )
                local found
                for i = 1, 16 do
                    local item = turtle.getItemDetail( i )
                    if item and isFuel[ item.name ] then
                        fuel, found = i, true
                        print( "[manager]: new fuel source " .. item.name .. ", in slot " .. i )
                        break
                    end
                end
                if not found then
                    print( "[manager]: no fuel source detected" )
                    continue = false
                    print( "[manager]: fuel reserves depleted: stopping..." )
                end
            end
        end
        sleep( 60 )
    end
end

local function timeChecker()
    local id
    if time > 0 then
        print( "[timeChecker]: starting time for " .. time .. " seconds" )
        id = os.startTimer( time )
    end
    while true do
        local event = {os.pullEvent()}
        if event[ 1 ] == "timer" and event[ 2 ] == id then
            print( "[timeChecker]: time is up!" )
            continue = false
        end
    end
end

local function branch()
    print( "[branch]: starting" )
    search.front()
    local gone = 0
    for i = 1, 16 do
        while not turtle.forward() do turtle.dig() end
        search.front()
        gone = gone + 1
        if not continue then
            break
        end
    end
    print( "[branch]: completed" )
    repeat
        if turtle.back() then
            gone = gone - 1
        end
    until gone == 0
    print( "[branch]: returned" )
end

local function main()
    print( "[main]: starting" )
    local gone = 1
    while continue do
        for i = 1, 4 do
            while not turtle.forward() do turtle.dig() end
            search.front()
        end
        gone = gone + 1
        turtle.turnRight()
        print( "[main]: starting right branch" )
        branch()
        turtle.turnLeft()
        if not continue then break end
        turtle.turnLeft()
        print( "[main]: starting left branch" )
        branch()
        turtle.turnRight()
    end
    print( "[main]: completed" )
    repeat
        if turtle.back() then
            gone = gone - 1
        end
    until gone == 0
    print( "[main]: returned" )
end

local mainCaller = function()
    local status, err = pcall( main )
    if not status then
        if term.isColor() then term.setTextColor( colors.red ) end
        print( "[mainCaller]: " .. err )
        error()
    end
end

local managerCaller = function()
    local status, err = pcall( manager )
    if not status then
        if term.isColor() then term.setTextColor( colors.red ) end
        print( "[managerCaller]: " .. err )
        error()
    end
end
parallel.waitForAny( timeChecker, mainCaller, managerCaller )