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Oil and natural gas properties
 12 Months Ended
Dec. 31, 2014
Extractive Industries [Abstract]  
Oil and natural gas properties
Oil and natural gas properties

During 2014 and 2013, the Navitus Energy Group, through its investment in Aurora, contributed $1,140,000 and $2,336,000, respectively. These funds were used primarily for exploration and development of oil and natural gas properties, as well as for other partnership purposes.
 
Oil and natural gas properties are comprised of the following:
 
 
 December 31,
 
2014
 
2013
Proved property
$
8,903,060

 
$
7,694,412

Unproved property
1,365,951

 
321,124

Work in process
—

 
25,897

Total oil and natural gas properties, at cost
10,269,011

 
8,041,433

Less: accumulated impairment
(7,430,438
)
 
(4,325,785
)
Oil and natural gas properties, net of impairment
2,838,573

 
3,715,648

Less: accumulated depletion
(1,942,380
)
 
(1,517,836
)
Oil and natural gas properties, net
896,193

 
2,197,812



Depletion, depreciation, and amortization expense for the years ended December 31, 2014 and 2013 was $430,912 and $378,398, respectively. During the years ended December 31, 2014 and 2013, the Company recorded impairment losses of $3,721,042 and $640,583, respectively.