space calculation

src/entities/base.coffee

@@ -7,3 +7,5 @@ class Base
   isMoveable: ->
     false
 
+  spaceProvided: 50
+    

src/entities/miner.coffee

@@ -7,3 +7,5 @@ class Miner
 
   isMoveable: ->
     true
+
+  spaceProvided: 5

src/entities/silo.coffee

@@ -17,3 +17,5 @@ class Silo
     else
       @frame += 1
 
+  spaceProvided: 150
+

src/game.coffee

@@ -71,6 +71,17 @@ app.game =
   miners: []
   maxTileAmount: 15
 
+  availableSiloStorage: ->
+    space = 0
+    for tile in app.game.map
+      space += tile.spaceProvided
+    space
+
+  usedSiloStorage: ->
+    space = 0
+    space += amount for resource, amount of @resources
+    space
+
   resources:
     stardust: 0
     dirt: 0