diff --git a/spec/command_spec.cr b/spec/command_spec.cr
index fc26b02..b0441e2 100644
--- a/spec/command_spec.cr
+++ b/spec/command_spec.cr
@@ -3,16 +3,36 @@ require "./spec_helper"
 module Game::TestCommand
   extend self
 
-  def create_map_2x2 : Map
+  def create_empty_map_2x2 : Map
+    Map.new 2, 2
+  end
+
+  def create_map_with_resource : Map
     map = Map.new 2, 2
-    map.set(MainBaseTile.new(Point.new(0, 0)))
-    map.set(CrystalTile.new(Point.new(1, 1), 100))
+    map.set BuildingTile.new(
+      Point.new(0, 0),
+      Building.new(
+        Building::Type::StartPoint,
+        storage: 200
+      )
+    )
+    map.set DepositTile.new(
+      Point.new(1, 1),
+      Deposit.new(Resource::Type::Crystals, 100)
+    )
+    map.set BuildingTile.new(
+      Point.new(0, 1),
+      Building.new(
+        Building::Type::CrystalMiner,
+        mining: Mining.new(20, Resource.new(Resource::Type::Crystals, 40))
+      )
+    )
     map
   end
 
   describe Command do
     it "should complete build command" do
-      world = World.new create_map_2x2
+      world = World.new create_empty_map_2x2
       point = Point.new 1, 0
       building = Building.new Building::Type::StartPoint, **{
         construction: Construction.free 10,
@@ -27,7 +47,7 @@ module Game::TestCommand
     end
 
     it "should restrict building if not enought resources" do
-      world = World.new create_map_2x2
+      world = World.new create_empty_map_2x2
       point = Point.new 1, 0
       building = Building.new Building::Type::StartPoint, **{
         construction: Construction.new(
@@ -42,5 +62,13 @@ module Game::TestCommand
         world.push(command)
       end
     end
+
+    it "should complete mining command" do
+      world = World.new create_map_with_resource
+      command = MineCommand.new Point.new(0, 1)
+      world.push command
+      world.run 20
+      world.resources[Resource::Type::Crystals].should eq 40
+    end
   end
 end
diff --git a/spec/deposit_spec.cr b/spec/deposit_spec.cr
index 0f3bf51..2b01da7 100644
--- a/spec/deposit_spec.cr
+++ b/spec/deposit_spec.cr
@@ -16,23 +16,26 @@ module Game::Test
 
     it "should be decreased with span" do
       dep = Deposit.new(Resource::Type::Crystals, 100)
-      dep.dec Resource.new(Resource::Type::Crystals, 20)
+      res = dep.dec Resource.new(Resource::Type::Crystals, 20)
       dep.cap.should eq 100
       dep.cur.should eq 80
+      res.amount.should eq 20
     end
 
     it "should not be increased above capacity" do
       dep = Deposit.new(Resource::Type::Crystals, 100, 20)
-      dep.inc Resource.new(Resource::Type::Crystals, 100)
+      res = dep.inc Resource.new(Resource::Type::Crystals, 100)
       dep.cap.should eq 100
       dep.cur.should eq 100
+      res.amount.should eq 80
     end
 
     it "should not be decreased below zero" do
       dep = Deposit.new(Resource::Type::Crystals, 100)
-      dep.dec Resource.new(Resource::Type::Crystals, 120)
+      res = dep.dec Resource.new(Resource::Type::Crystals, 120)
       dep.cap.should eq 100
       dep.cur.should eq 0
+      res.amount.should eq 100
     end
   end
 end
diff --git a/src/game/command.cr b/src/game/command.cr
index 84c6f8c..bc2fefc 100644
--- a/src/game/command.cr
+++ b/src/game/command.cr
@@ -43,29 +43,34 @@ 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)
-      # if deposit_tile
-      #   @holded = deposit_tile.dep.dec(mining.resource)
-      # end
+      deposit_tile = nearest_deposit(world, mining.resource.type)
+      if deposit_tile
+        @holded = deposit_tile.as(DepositTile).dep.dec(mining.resource)
+      end
       mining.ts
     end
 
     def finish(world : World)
       if @holded
-        # world.resources.inc(@holded)
+        holded = @holded.as(Resource)
+        world.resources.inc(holded.type, holded.amount)
       end
       world.push(MineCommand.new(@point))
     end
 
     def desc : String
-      sprintf "Mine `smth` from %d,%d", @point.x, @point.y
+      if @holded
+        sprintf "Mine %s from %d,%d", @holded.as(Resource).type, @point.x, @point.y
+      else
+        sprintf "Wait for resources at %d,%d", @point.x, @point.y
+      end
     end
 
-    # private def nearest_deposit(world : World, res_type : Resource::Type)
-    #   world.map.nearest_tile @point do |tile|
-    #     tile.is_a?(DepositTile) && tile.dep.type == res_type && tile.dep.cur > 0
-    #   end
-    # end
+    private def nearest_deposit(world : World, res_type : Resource::Type)
+      world.map.nearest_tile @point do |tile|
+        tile.is_a?(DepositTile) && tile.dep.type == res_type && tile.dep.cur > 0
+      end
+    end
   end
 
   # class BuildCrystalHarvesterCommand < Command
diff --git a/src/game/deposit.cr b/src/game/deposit.cr
index 622b165..05ce8e3 100644
--- a/src/game/deposit.cr
+++ b/src/game/deposit.cr
@@ -12,14 +12,28 @@ class Game::Deposit
   getter cap
   getter cur
 
-  def inc(resource : Resource)
+  def inc(resource : Resource) : Resource
     check_res resource.type
-    @cur = Math.min(@cap, @cur + resource.amount)
+    if @cur + resource.amount <= @cap
+      @cur += resource.amount
+      Resource.new(resource.type, resource.amount)
+    else
+      res = Resource.new(resource.type, @cap - @cur)
+      @cur = @cap
+      res
+    end
   end
 
-  def dec(resource : Resource)
+  def dec(resource : Resource) : Resource
     check_res resource.type
-    @cur = Math.max(0, @cur - resource.amount)
+    if @cur >= resource.amount
+      @cur -= resource.amount
+      resource
+    else
+      res = Resource.new(resource.type, @cur)
+      @cur = 0
+      res
+    end
   end
 
   private def check_res(other_res_type : Resource::Type)
diff --git a/src/game/resources.cr b/src/game/resources.cr
index d2126dd..7dae9c3 100644
--- a/src/game/resources.cr
+++ b/src/game/resources.cr
@@ -11,6 +11,10 @@ struct Game::Resource
 
   getter type
   getter amount
+
+  def with_amount(amount : Capacity) : self
+    self.new @type, amount
+  end
 end
 
 class Game::ResourceBag