Joint Filing Agreement
Exhibit 99.1
Each of the undersigned hereby agrees to file jointly the Statement on Schedule 13D to which this
Agreement is attached (the “Schedule 13D”) and any amendments to the Schedule 13D with respect to
the Common Stock of Crimson Exploration Inc. which may be deemed necessary pursuant to Regulation
13D under the Securities Exchange Act of 1934.
It is understood and agreed that each of the parties hereto is responsible for the timely filing of
such statement and any future amendments to Schedule 13D, and for the completeness and accuracy of
the information concerning such party contained therein, but such party is not responsible for the
completeness or accuracy of information concerning any other party unless such party knows or has
reason to believe that such information is inaccurate.
It is understood and agreed that a copy of this Agreement shall be attached as an exhibit to the
Schedule 13D, and any future amendments to the Schedule 13D, filed on behalf of each of the parties
hereto.
Dated: November 3, 2010
| America Capital Energy Corporation |
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| By: | /s/ Ni Zhaoxing | |||
| Name: | Ni Zhaoxing | |||
| Title: | Chief Executive Officer | |||
| Shanghai Xxxxx Xxxx Property Group,
Co., Ltd. |
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| By: | /s/ Ni Zhaoxing | |||
| Name: | Ni Zhaoxing | |||
| Title: | Chief Executive Officer | |||
| /s/ Ni Zhaoxing | ||||
| Ni Zhaoxing | ||||
