diff --git a/spec/deposit_spec.cr b/spec/deposit_spec.cr
index 2b01da7..9f87eda 100644
--- a/spec/deposit_spec.cr
+++ b/spec/deposit_spec.cr
@@ -16,26 +16,26 @@ module Game::Test
 
     it "should be decreased with span" do
       dep = Deposit.new(Resource::Type::Crystals, 100)
-      res = dep.dec Resource.new(Resource::Type::Crystals, 20)
+      res = dep.dec 20
       dep.cap.should eq 100
       dep.cur.should eq 80
-      res.amount.should eq 20
+      res.should eq 20
     end
 
     it "should not be increased above capacity" do
       dep = Deposit.new(Resource::Type::Crystals, 100, 20)
-      res = dep.inc Resource.new(Resource::Type::Crystals, 100)
+      res = dep.inc 100
       dep.cap.should eq 100
       dep.cur.should eq 100
-      res.amount.should eq 80
+      res.should eq 80
     end
 
     it "should not be decreased below zero" do
       dep = Deposit.new(Resource::Type::Crystals, 100)
-      res = dep.dec Resource.new(Resource::Type::Crystals, 120)
+      res = dep.dec 120
       dep.cap.should eq 100
       dep.cur.should eq 0
-      res.amount.should eq 100
+      res.should eq 100
     end
   end
 end
diff --git a/src/game/command.cr b/src/game/command.cr
index 672aa5e..f8e9cf8 100644
--- a/src/game/command.cr
+++ b/src/game/command.cr
@@ -51,9 +51,10 @@ module Game
       tile = world.map.get(@point).as(BuildingTile)
       building = tile.building
       mining = building.mining.as(Mining)
-      deposit_tile = nearest_deposit(world, mining.resource.type)
+      resource = mining.resource
+      deposit_tile = nearest_deposit(world, resource.type)
       if deposit_tile
-        @holded = deposit_tile.dep.dec(mining.resource)
+        @holded = Resource.new resource.type, deposit_tile.dep.dec(resource.amount)
       end
       mining.ts
     end
@@ -98,17 +99,18 @@ module Game
       if !world.resources.has(restoration.input)
         return restoration.ts
       end
-      @deposit_tile = nearest_deposit(world, restoration.resource.type)
+      resource = restoration.resource
+      @deposit_tile = nearest_deposit(world, resource.type)
       if @deposit_tile
         world.resources.dec restoration.input
-        @holded = restoration.resource
+        @holded = resource
       end
       restoration.ts
     end
 
     def finish(world : World)
       if @deposit_tile && @holded
-        @deposit_tile.as(DepositTile).dep.inc(@holded.as(Resource))
+        @deposit_tile.as(DepositTile).dep.inc(@holded.as(Resource).amount)
       end
       if !@once
         world.push(RestoreCommand.new(@point))
diff --git a/src/game/deposit.cr b/src/game/deposit.cr
index 03318a7..f6cfda5 100644
--- a/src/game/deposit.cr
+++ b/src/game/deposit.cr
@@ -13,33 +13,25 @@ class Game::Deposit
   getter cap
   getter cur
 
-  def inc(resource : Resource) : Resource
-    check_res resource.type
-    if @cur + resource.amount <= @cap
-      @cur += resource.amount
-      Resource.new(resource.type, resource.amount)
+  def inc(value : Capacity) : Capacity
+    if @cur + value <= @cap
+      @cur += value
+      value
     else
-      res = Resource.new(resource.type, @cap - @cur)
+      res = @cap - @cur
       @cur = @cap
       res
     end
   end
 
-  def dec(resource : Resource) : Resource
-    check_res resource.type
-    if @cur >= resource.amount
-      @cur -= resource.amount
-      resource
+  def dec(value : Capacity) : Capacity
+    if @cur >= value
+      @cur -= value
+      value
     else
-      res = Resource.new(resource.type, @cur)
+      res = @cur
       @cur = 0
       res
     end
   end
-
-  private def check_res(other_res_type : Resource::Type)
-    if @type != other_res_type
-      raise ResourceMismatch.new
-    end
-  end
 end