diff --git a/LICENSE.txt b/LICENSE.txt
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--- /dev/null
+++ b/LICENSE.txt
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+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
diff --git a/README.md b/README.md
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+++ b/README.md
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+# Gravel Sieve Mod
+This mod include two new tools:
+ - a hammer to produce gravel from cobble
+ - a sieve to sift gravel in order to find ores.
+
+Browse on: ![GitHub](https://github.com/joe7575/Minetest-Gravelsieve)
+
+Download: ![GitHub](https://github.com/joe7575/Minetest-Gravelsieve/archive/master.zip)
+
+
+## Dependencies
+default  
+
+# License
+Copyright (C) 2017 Joachim Stolberg  
+Code: Licensed under the GNU LGPL version 2.1 or later. See LICENSE.txt and http://www.gnu.org/licenses/lgpl-2.1.txt  
+Textures: CC0
+
diff --git a/depends.txt b/depends.txt
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--- /dev/null
+++ b/depends.txt
@@ -0,0 +1 @@
+default
diff --git a/description.txt b/description.txt
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index 0000000..e20287d
--- /dev/null
+++ b/description.txt
@@ -0,0 +1 @@
+This mod includes a hammer to produce gravel, and a sieve to sift gravel in order to find ores.
diff --git a/hammer.lua b/hammer.lua
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--- /dev/null
+++ b/hammer.lua
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+--[[
+
+	Gravel Sieve Mod
+	================
+
+	v0.01 by JoSt
+    Derived from the work of RealBadAngel, Maciej Kasatkin (screwdriver)
+
+	Copyright (C) 2017 Joachim Stolberg
+    Copyright (C) 2013-2016 RealBadAngel, Maciej Kasatkin
+    Copyright (C) 2013-2016 Various Minetest developers and contributors
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	History:
+	2017-06-04  v0.01  first version
+
+]]--
+
+
+gravelsieve.disallow = function(pos, node, user, mode, new_param2)
+	return false
+end
+
+-- Handles rotation
+gravelsieve.handler = function(itemstack, user, pointed_thing)
+	if pointed_thing.type ~= "node" then
+		return
+	end
+
+	local pos = pointed_thing.under
+
+	if minetest.is_protected(pos, user:get_player_name()) then
+		minetest.record_protection_violation(pos, user:get_player_name())
+		return
+	end
+
+	local node = minetest.get_node(pos)
+	if node.name == "default:cobble" then
+		node.name = "default:gravel"
+        minetest.swap_node(pos, node)
+        minetest.sound_play({
+            name="default_dig_crumbly"},{
+            gain=1,
+            max_hear_distance=20,
+            loop=false})
+	end
+
+	return itemstack
+end
+
+-- hammer
+minetest.register_tool("gravelsieve:hammer", {
+	description = "Hammer converts any kind of stone to gravel",
+	inventory_image = "gravelsieve_hammer.png",
+	on_use = function(itemstack, user, pointed_thing)
+		hammer.handler(itemstack, user, pointed_thing)
+		return itemstack
+	end,
+-- 	on_place = function(itemstack, user, pointed_thing)
+-- 		hammer.handler(itemstack, user, pointed_thing)
+-- 		return itemstack
+-- 	end,
+})
+
+
+minetest.register_craft({
+	output = "gravelsieve:hammer",
+	recipe = {
+		{"", "default:steel_ingot", ""},
+		{"", "group:stick", "default:steel_ingot"},
+		{"group:stick", "", ""},
+	}
+})
+
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..7b6af2d
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,257 @@
+--[[
+
+	Gravel Sieve Mod
+	================
+
+	v0.01 by JoSt
+    Derived from the work of celeron55, Perttu Ahola  (furnace)
+
+	Copyright (C) 2017 Joachim Stolberg
+    Copyright (C) 2011-2016 celeron55, Perttu Ahola <celeron55@gmail.com>
+    Copyright (C) 2011-2016 Various Minetest developers and contributors
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	History:
+	2017-06-04  v0.01  first version
+
+]]--
+
+gravelsieve = {
+    rand = PseudoRandom(1234)
+}
+
+dofile(minetest.get_modpath("gravelsieve") .. "/hammer.lua")
+
+
+local sieve_table = {
+    iron_lump = 15,
+    copper_lump = 15,
+    tin_lump = 15,
+    gold_lump = 25,
+    mese_crystal = 25,
+    diamond = 50,
+}
+
+
+local sieve_formspec =
+    "size[8,8]"..
+    "list[context;src;1,1;1,1;]"..
+    "image[3,1;1,1;gui_furnace_arrow_bg.png^[transformR270]"..
+    "list[context;dst;4,0;4,3;]"..
+    "list[current_player;main;0,4;8,4;]"
+
+local function can_dig(pos, player)
+	local meta = minetest.get_meta(pos);
+	local inv = meta:get_inventory()
+	return inv:is_empty("dst") and inv:is_empty("src")
+    --return true
+end
+
+local function allow_metadata_inventory_put(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	if listname == "src" then
+		return stack:get_count()
+	elseif listname == "dst" then
+		return 0
+	end
+end
+
+local function allow_metadata_inventory_move(pos, from_list, from_index, to_list, to_index, count, player)
+	local meta = minetest.get_meta(pos)
+	local inv = meta:get_inventory()
+	local stack = inv:get_stack(from_list, from_index)
+	return allow_metadata_inventory_put(pos, to_list, to_index, stack, player)
+end
+
+local function allow_metadata_inventory_take(pos, listname, index, stack, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return 0
+	end
+	return stack:get_count()
+end
+
+local function swap_node(pos, meta)
+	local node = minetest.get_node(pos)
+
+    idx = meta:get_int("idx")
+    idx = (idx + 1) % 4
+    meta:set_int("idx", idx)
+    node.name = "gravelsieve:sieve"..idx
+	minetest.swap_node(pos, node)
+    return idx == 3
+end
+
+local function random_ore(inv, src)
+    local num
+    local result = false
+    for ore, probability in pairs(sieve_table) do
+        if src:get_name() == "gravelsieve:gravel1" then
+            probability = probability * 2
+        elseif src:get_name() == "gravelsieve:gravel2" then
+            probability = probability * 4
+        elseif src:get_name() == "gravelsieve:gravel3" then
+            probability = probability * 8
+        end
+        num = gravelsieve.rand:next(0, probability)
+        if num == probability then
+            item = ItemStack("default:"..ore)
+            if inv:room_for_item("dst", item) then
+                inv:add_item("dst", item)
+                return true
+            end
+        end
+    end
+    return result
+end
+        
+local function move_src2dst(meta, pos, inv, src, dst)
+    if inv:room_for_item("dst", dst) and inv:contains_item("src", src) then
+        local res = swap_node(pos, meta)
+        if res then
+            if not random_ore(inv, src) then
+                inv:add_item("dst", dst)
+            end
+            inv:remove_item("src", src)
+        end
+        return true
+    end
+    return false
+end
+
+
+local function sieve_node_timer(pos, elapsed)
+
+    local meta = minetest.get_meta(pos)
+    local inv = meta:get_inventory()
+    local gravel = ItemStack("default:gravel")
+    local gravel1 = ItemStack("gravelsieve:gravel1")
+    local gravel2 = ItemStack("gravelsieve:gravel2")
+    local gravel3 = ItemStack("gravelsieve:gravel3")
+
+    if move_src2dst(meta, pos, inv, gravel, gravel1) then
+        return true
+    elseif move_src2dst(meta, pos, inv, gravel1, gravel2) then
+        return true
+    elseif move_src2dst(meta, pos, inv, gravel2, gravel3) then
+        return true
+    else
+        minetest.get_node_timer(pos):stop()
+        return false
+    end
+end
+
+
+for idx = 0,4 do
+    local nodebox_data = {
+        { -8/16, -8/16, -8/16,   8/16, 4/16, -6/16 },
+        { -8/16, -8/16,  6/16,   8/16, 4/16,  8/16 },
+        { -8/16, -8/16, -8/16,  -6/16, 4/16,  8/16 },
+        {  6/16, -8/16, -8/16,   8/16, 4/16,  8/16 },
+        { -6/16, -2/16, -6/16,  6/16, 8/16, 6/16 },
+    }
+    nodebox_data[5][5] =    (8 - 2*idx) / 16
+
+    local tiles_data = {
+        -- up, down, right, left, back, front
+        "gravelsieve_gravel.png",
+        "gravelsieve_gravel.png",
+        "gravelsieve_sieve.png",
+        "gravelsieve_sieve.png",
+        "gravelsieve_sieve.png",
+        "gravelsieve_sieve.png",
+    }
+    if idx == 3 then
+        tiles_data[1] = "gravelsieve_top.png"
+    end
+    
+    minetest.register_node("gravelsieve:sieve"..idx, {
+        description = "Gravel Sieve "..idx,
+        tiles = tiles_data,
+        drawtype = "nodebox",
+        node_box = {
+            type = "fixed",
+            fixed = nodebox_data,
+        },
+
+        can_dig = can_dig,
+        on_timer = sieve_node_timer,
+
+        on_construct = function(pos)
+            local meta = minetest.get_meta(pos)
+            meta:set_int("idx", idx)
+            meta:set_string("formspec", sieve_formspec)
+            local inv = meta:get_inventory()
+            inv:set_size('src', 1)
+            inv:set_size('dst', 12)
+        end,
+
+        on_metadata_inventory_move = function(pos)
+            minetest.get_node_timer(pos):start(1.0)
+        end,
+
+        on_metadata_inventory_take = function(pos)
+            minetest.get_node_timer(pos):start(1.0)
+        end,
+
+        on_metadata_inventory_put = function(pos)
+             minetest.get_node_timer(pos):start(1.0)
+        end,
+
+        allow_metadata_inventory_put = allow_metadata_inventory_put,
+        allow_metadata_inventory_move = allow_metadata_inventory_move,
+        allow_metadata_inventory_take = allow_metadata_inventory_take,
+
+        paramtype2 = "facedir",
+        sunlight_propagates = true,
+        is_ground_content = false,
+        groups = {cracky=3, stone=1, uber=1},
+    })
+end
+
+minetest.register_node("gravelsieve:gravel1", {
+	description = "Gravel sifted 1",
+	tiles = {"default_gravel.png"},
+	groups = {crumbly = 2, falling_node = 1},
+	sounds = default.node_sound_gravel_defaults(),
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {'default:flint'}, rarity = 16},
+			{items = {'default:gravel'}}
+		}
+	}
+})
+
+minetest.register_node("gravelsieve:gravel2", {
+	description = "Gravel sifted 2",
+	tiles = {"default_gravel.png"},
+	groups = {crumbly = 2, falling_node = 1},
+	sounds = default.node_sound_gravel_defaults(),
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {'default:flint'}, rarity = 16},
+			{items = {'default:gravel'}}
+		}
+	}
+})
+
+minetest.register_node("gravelsieve:gravel3", {
+	description = "Gravel sifted 3",
+	tiles = {"default_gravel.png"},
+	groups = {crumbly = 2, falling_node = 1},
+	sounds = default.node_sound_gravel_defaults(),
+	drop = {
+		max_items = 1,
+		items = {
+			{items = {'default:flint'}, rarity = 16},
+			{items = {'default:gravel'}}
+		}
+	}
+})
diff --git a/textures/gravelsieve_gravel.png b/textures/gravelsieve_gravel.png
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diff --git a/textures/gravelsieve_hammer.png b/textures/gravelsieve_hammer.png
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diff --git a/textures/gravelsieve_sieve.png b/textures/gravelsieve_sieve.png
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diff --git a/textures/gravelsieve_top.png b/textures/gravelsieve_top.png
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