SIRG had a great day. Up 21% of volume of 75K shares shows how tight the float is held.

Detailed Quote for Sierra Resource Group Inc. (SIRG)    
$ 0.0069 RTx         0.0012 (+21.05%)      Volume: 75.64 k      3:55 PM EDT Mar 27, 2013

Time & Sales   
Price    Size       Exch    Time
$0.0069    10,000       OBB    15:55:28
$0.0065    30,200       OBB    15:53:44
$0.0060    1,000       OBB    15:53:07
$0.0065    10,000       OBB    15:52:40
$0.0060    10,000       OBB    15:52:00
$0.0053    14,436       OBB    12:21:36