diff --git a/spec/command_spec.cr b/spec/command_spec.cr
index b0441e2..57bb5bc 100644
--- a/spec/command_spec.cr
+++ b/spec/command_spec.cr
@@ -18,13 +18,26 @@ module Game::TestCommand
     )
     map.set DepositTile.new(
       Point.new(1, 1),
-      Deposit.new(Resource::Type::Crystals, 100)
+      Deposit.new(Resource::Type::Crystals, 1000, 500)
+    )
+    map.set DepositTile.new(
+      Point.new(1, 0),
+      Deposit.new(Resource::Type::Crystals, 1000, 0)
     )
     map.set BuildingTile.new(
       Point.new(0, 1),
       Building.new(
         Building::Type::CrystalMiner,
-        mining: Mining.new(20, Resource.new(Resource::Type::Crystals, 40))
+        mining: Mining.new(
+          ts: 20,
+          resource: Resource.new(Resource::Type::Crystals, 40),
+          input: ResourceBag.new
+        ),
+        restoration: Mining.new(
+          ts: 20,
+          resource: Resource.new(Resource::Type::Crystals, 40),
+          input: ResourceBag.new({Resource::Type::Crystals => 5})
+        )
       )
     )
     map
@@ -65,10 +78,27 @@ module Game::TestCommand
 
     it "should complete mining command" do
       world = World.new create_map_with_resource
-      command = MineCommand.new Point.new(0, 1)
+      command = MineCommand.new Point.new(0, 1), once: true
       world.push command
       world.run 20
+      # Check world resources
       world.resources[Resource::Type::Crystals].should eq 40
+      # Check tile deposit
+      tile = world.map.get(1, 1).as(DepositTile)
+      tile.dep.cur.should eq 460
+    end
+
+    it "should complete restore command" do
+      world = World.new create_map_with_resource
+      world.resources.inc(Resource::Type::Crystals, 20)
+      command = RestoreCommand.new Point.new(0, 1), once: true
+      world.push command
+      world.run 20
+      # Check world resources
+      world.resources[Resource::Type::Crystals].should eq 15
+      # Check tile deposit
+      tile = world.map.get(1, 0).as(DepositTile)
+      tile.dep.cur.should eq 40
     end
   end
 end
diff --git a/spec/resources_spec.cr b/spec/resources_spec.cr
index 9d7bf88..976078c 100644
--- a/spec/resources_spec.cr
+++ b/spec/resources_spec.cr
@@ -25,5 +25,29 @@ module Game::TestResourceBag
       res = Res.new
       res.has({ResType::Crystals => 50}).should be_false
     end
+
+    it "should inc single value" do
+      res = Res.new ({ResType::Crystals => 10})
+      res.inc ResType::Crystals, 5
+      res[ResType::Crystals].should eq 15
+    end
+
+    it "should inc resource" do
+      res = Res.new ({ResType::Crystals => 10})
+      res.inc Resource.new(ResType::Crystals, 5)
+      res[ResType::Crystals].should eq 15
+    end
+
+    it "should inc hash" do
+      res = Res.new ({ResType::Crystals => 10})
+      res.inc ({ResType::Crystals => 5})
+      res[ResType::Crystals].should eq 15
+    end
+
+    it "should inc other bag" do
+      res = Res.new ({ResType::Crystals => 10})
+      res.inc Res.new({ResType::Crystals => 5})
+      res[ResType::Crystals].should eq 15
+    end
   end
 end
diff --git a/src/game/building.cr b/src/game/building.cr
index 5abd976..9600b02 100644
--- a/src/game/building.cr
+++ b/src/game/building.cr
@@ -9,11 +9,12 @@ module Game
   end
 
   class Mining
-    def initialize(@ts : TimeSpan, @resource : Resource)
+    def initialize(@ts : TimeSpan, @resource : Resource, @input : ResourceBag)
     end
 
     getter ts
     getter resource
+    getter input
   end
 
   class Construction
diff --git a/src/game/building_factory.cr b/src/game/building_factory.cr
index 3e73bd0..dc19081 100644
--- a/src/game/building_factory.cr
+++ b/src/game/building_factory.cr
@@ -11,7 +11,8 @@ module Game
         Building.new Building::Type::CrystalMiner, **{
           mining: Mining.new(
             ts: 20,
-            resource: Resource.new(Resource::Type::Crystals, 40)
+            resource: Resource.new(Resource::Type::Crystals, 40),
+            input: ResourceBag.new
           ),
         }
       )
@@ -27,7 +28,8 @@ module Game
           ),
           restoration: Mining.new(
             ts: 30,
-            resource: Resource.new(Resource::Type::Crystals, 20)
+            resource: Resource.new(Resource::Type::Crystals, 20),
+            input: ResourceBag.new
           ),
         }
       )
diff --git a/src/game/command.cr b/src/game/command.cr
index 22fe8b0..672aa5e 100644
--- a/src/game/command.cr
+++ b/src/game/command.cr
@@ -36,7 +36,7 @@ module Game
   class MineCommand < Command
     @holded : Resource? = nil
 
-    def initialize(@point : Point)
+    def initialize(@point : Point, *, @once = false)
     end
 
     def desc : String
@@ -63,7 +63,9 @@ module Game
         holded = @holded.as(Resource)
         world.resources.inc(holded)
       end
-      world.push(MineCommand.new(@point))
+      if !@once
+        world.push(MineCommand.new(@point))
+      end
     end
 
     private def nearest_deposit(world : World, res_type : Resource::Type) : DepositTile?
@@ -74,6 +76,53 @@ module Game
     end
   end
 
+  class RestoreCommand < Command
+    @holded : Resource? = nil
+    @deposit_tile : DepositTile? = nil
+
+    def initialize(@point : Point, *, @once = false)
+    end
+
+    def desc : String
+      if @holded
+        sprintf "Restore %s from %d,%d", @holded.type, @point.x, @point.y
+      else
+        sprintf "Wait for resources at %d,%d", @point.x, @point.y
+      end
+    end
+
+    def start(world : World) : TimeSpan
+      tile = world.map.get(@point).as(BuildingTile)
+      building = tile.building
+      restoration = building.restoration.as(Mining)
+      if !world.resources.has(restoration.input)
+        return restoration.ts
+      end
+      @deposit_tile = nearest_deposit(world, restoration.resource.type)
+      if @deposit_tile
+        world.resources.dec restoration.input
+        @holded = restoration.resource
+      end
+      restoration.ts
+    end
+
+    def finish(world : World)
+      if @deposit_tile && @holded
+        @deposit_tile.as(DepositTile).dep.inc(@holded.as(Resource))
+      end
+      if !@once
+        world.push(RestoreCommand.new(@point))
+      end
+    end
+
+    private def nearest_deposit(world : World, res_type : Resource::Type) : DepositTile?
+      tile = world.map.nearest_tile @point do |tile|
+        tile.is_a?(DepositTile) && tile.dep.type == res_type && tile.dep.cur == 0
+      end
+      tile.as?(DepositTile)
+    end
+  end
+
   # class BuildCrystalHarvesterCommand < Command
   #   BUILD_TIME = 30
 
diff --git a/src/game/deposit.cr b/src/game/deposit.cr
index 05ce8e3..03318a7 100644
--- a/src/game/deposit.cr
+++ b/src/game/deposit.cr
@@ -1,4 +1,5 @@
 class Game::Deposit
+  @cap : Capacity = 0
   @cur : Capacity = 0
 
   def initialize(@type : Resource::Type, @cap : Capacity)
diff --git a/src/game/resources.cr b/src/game/resources.cr
index b20b077..a2163e7 100644
--- a/src/game/resources.cr
+++ b/src/game/resources.cr
@@ -26,15 +26,12 @@ class Game::ResourceBag
     @values = ResourceHash.new
     Resource::Type.each { |t, v| @values[t] = 0 }
     if vals.is_a?(ResourceHash)
-      vals.each do |i|
-        t, v = i
-        @values[t] = v
-      end
+      add_amounts vals
     end
   end
 
   def [](res_type : Resource::Type)
-    @values.fetch(res_type, 0)
+    @values[res_type]
   end
 
   def has(res_type : Resource::Type, value : Capacity) : Bool
@@ -42,38 +39,68 @@ class Game::ResourceBag
   end
 
   def has(res : Resource) : Bool
-    has(res.type, res.amount)
+    has res.type, res.amount
   end
 
   def has(vs : ResourceHash) : Bool
-    vs.reduce true do |acc, entry|
-      t = entry[0]
-      v = entry[1]
-      acc && @values[t] >= v
-    end
+    has_amounts vs
   end
 
   def has(vs : self) : Bool
-    has vs.to_hash
+    has_amounts vs.@values
   end
 
   def inc(res_type : Resource::Type, value : Capacity)
-    new_value = @values[res_type] + value
-    if new_value < 0
-      raise NotEnoughtResources.new
-    end
-    @values[res_type] = new_value
+    validate_add_amounts ({res_type => value})
+    @values[res_type] += value
   end
 
   def inc(res : Resource)
-    inc(res.type, res.amount)
+    inc res.type, res.amount
+  end
+
+  def inc(vs : ResourceHash)
+    validate_add_amounts vs
+    add_amounts vs
+  end
+
+  def inc(other : self)
+    inc other.@values
   end
 
   def dec(res_type : Resource::Type, value : Capacity)
-    inc(res_type, -value)
+    inc res_type, -value
   end
 
-  def to_hash : ResourceHash
-    @values.clone
+  def dec(other : self)
+    inverted = other.@values.transform_values { |v| -v }
+    inc inverted
+  end
+
+  private def can_add_amounts(vs : ResourceHash)
+    vs.reduce true do |acc, entry|
+      res_type, amount = entry
+      acc && @values[res_type] + amount >= 0
+    end
+  end
+
+  private def validate_add_amounts(vs : ResourceHash)
+    if !can_add_amounts(vs)
+      raise NotEnoughtResources.new
+    end
+  end
+
+  private def add_amounts(vs : ResourceHash)
+    vs.each do |entry|
+      res_type, amount = entry
+      @values[res_type] += amount
+    end
+  end
+
+  private def has_amounts(vs : ResourceHash)
+    vs.reduce true do |acc, entry|
+      res_type, amount = entry
+      acc && @values[res_type] >= amount
+    end
   end
 end