diff --git a/lib/engine/game/g_18_co.rb b/lib/engine/game/g_18_co.rb
index 343808948e..1610aed8e2 100644
--- a/lib/engine/game/g_18_co.rb
+++ b/lib/engine/game/g_18_co.rb
@@ -114,7 +114,7 @@ def mines_count(entity)
       end
 
       def mine_multiplier(entity)
-        entity.abilities(:mine_multiplier).collect(&:count_per_or).reject(&:zero?).inject(1, :*)
+        entity.abilities(:mine_multiplier).map(&:count_per_or).reject(&:zero?).reduce(1, :*)
       end
 
       def mines_total(entity)
diff --git a/lib/engine/step/g_18_co/track.rb b/lib/engine/step/g_18_co/track.rb
index 8f032a7db3..ab7d3d1d1f 100644
--- a/lib/engine/step/g_18_co/track.rb
+++ b/lib/engine/step/g_18_co/track.rb
@@ -10,7 +10,7 @@ def process_lay_tile(action)
           lay_tile_action(action)
 
           # Mine Token Collection
-          unless action.hex.tile.icons.select { |icon| icon.name == 'mine' }.empty?
+          if action.hex.tile.icons.map(&:name).include?('mine')
             # Remove mine symbol from hex
             action.hex.tile.icons.reject! { |icon| icon.name == 'mine' }