Exhibit 99.1

		N e w s R e l e a s e QUICKSILVER RESOURCES INC. 801 Cherry Street Fort Worth, TX 76102 www.qrinc.com

Quicksilver Resources Reports 2010 Fourth-Quarter and Full-Year Results

FORT WORTH, TEXAS (February 28, 2011) — Quicksilver Resources Inc. (NYSE: KWK) today reported net income of $318.3 million ($1.77 per diluted share) in the 2010 fourth quarter as compared to net income of $32.5 million ($0.19 per diluted share) in the prior-year period. For all of 2010, the company reported net income of $435.1 million ($2.45 per diluted share) as compared to a net loss of $557.5 million (a loss of $3.30 per diluted share) for 2009.

Fourth-quarter 2010 adjusted net income, a non-GAAP financial measure, was $30.0 million ($0.18 per diluted share), as compared to adjusted net income of $47.3 million ($0.27 per diluted share) in the 2009 period. Adjusted net income for full-year 2010 was $119.9 million ($0.70 per diluted share) as compared to $148.4 million ($0.86 per diluted share) for the prior year. Details of adjusted net income are included in the tables at the end of this news release.

2010 Highlights

	•		Produced record volumes of 355 MMcfe per day — up 9% year-over-year
	•		Increased reserves 20% to 2.9 Tcfe — 68% are proved developed
	•		Replaced 475% of production
	•		Reduced lease operating expense to $0.65 per Mcfe — down 3% year-over-year
	•		Acquired additional interests in core properties at Lake Arlington and Horseshoe Canyon
	•		Proved additional Horn River acreage potential
	•		Completed divestment of all interests in Quicksilver Gas Services
	•		Increased exposure to high-potential oil plays
	•		Self-funded all capital investments
	•		Reduced total debt by $537 million — total debt of $0.65 per Mcfe of proved reserve

Production

Production averaged a record 389.2 million cubic feet of natural gas equivalent (MMcfe) per day during the fourth quarter, up 20% from the prior-year quarter. For full-year 2010, production averaged 355.2 MMcfe per day, up 9% from the 2009 total. The increase in production was primarily driven by higher volumes from the Barnett Shale. The 2010 production volumes were comprised 79% from natural gas, 20% from natural gas liquids (NGLs) and 1% from crude oil and condensate.

Revenue and Expenses

Sales of natural gas, NGLs and crude oil for the fourth quarter of 2010 were $224.9 million, up 4% from $215.5 million in the prior-year quarter. Sales of natural gas, NGLs and crude oil totaled $856.3 million for full-year 2010, up approximately 7% from 2009. The increase in product sales was primarily derived from the 9% increase in production volumes coupled with increased realized prices for NGLs and crude oil, which were offset in part by lower realized prices on natural gas.

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Unit lease operating expense declined $0.05 per thousand cubic feet of natural gas equivalents (Mcfe) to $0.62 per Mcfe in the fourth quarter of 2010 and averaged $0.65 per Mcfe for full-year 2010, down 3% from the 2009 rate. Unit gathering, processing and transportation expense was $1.20 per Mcfe and $0.73 per Mcfe for the fourth quarter and full year of 2010, respectively. Both periods reflect the higher reported costs of these activities following the sale of the company’s interests in Quicksilver Gas Services on October 1, 2010.

Impact from BreitBurn Ownership

For the 2010 fourth quarter, Quicksilver reported a loss of $1.9 million attributable to the company’s approximate 29% interest in BreitBurn Energy Partners L.P.’s (Nasdaq: BBEP) third-quarter 2010 results, including losses of approximately $9.5 million from derivatives. During the fourth quarter of 2010, Quicksilver received approximately $6.1 million in cash distributions associated with its ownership of BreitBurn units. For full-year 2010, Quicksilver received $20.9 million in distributions and an additional $18 million related to the settlement of the BreitBurn litigation.

Total Debt

At December 31, 2010, the company’s total debt was approximately $1.9 billion, a reduction of approximately $537 million from year-end 2009. Total debt per proved reserve equivalent has been reduced to $0.65 per Mcfe. Currently, Quicksilver Resources has approximately $836 million available under its $1 billion senior secured revolving credit facility.

Operational Update

In the Barnett Shale, the company drilled 20 (17.8 net) operated wells and connected 38 (27.3 net) operated wells to sales during the fourth quarter. For full-year 2010, the company drilled 96 (81.6 net) operated wells and connected 116 (93.2 net) operated wells to sales. At year end 2010, Quicksilver had an inventory of 121 operated wells that were drilled but uncompleted in the Barnett Shale.

During 2010 in the Horseshoe Canyon area of Alberta, Canada, the company drilled 14 (9.9 net) wells and connected 54 (36.6 net) wells to sales lines. As previously announced, in October 2010, Quicksilver acquired interests in an additional 47,000 gross (21,700 net) acres in the Joffre area of the Horseshoe Canyon, where the company already operates. The $22 million acquisition included approximately 23 billion cubic feet of proved developed natural gas reserves and net production of approximately 5 million cubic feet (MMcf) per day of natural gas.

In the Horn River Basin of northeast British Columbia, Quicksilver has now drilled six horizontal wells into the Muskwa and Klua formations and four wells have commenced production. The company expects to finish drilling activities on two additional Muskwa wells before spring break-up begins in late March. In addition the company has drilled its first horizontal well into the Exshaw formation. Completion activities on the most recent four Muskwa wells and Exshaw well are anticipated to begin this summer.

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Capital

During the fourth quarter of 2010, the company incurred capital costs of approximately $180 million. This resulted in total capital costs for the year of approximately $588 million, of which approximately 77% was associated with drilling and completion activities, approximately 13% for midstream activities, approximately 8% for acreage purchases and approximately 2% for other assets. In addition, the company completed acquisitions totaling $147 million for additional interests in the Lake Arlington project in the Barnet Shale and the Joffre property in Horseshoe Canyon.

First-Quarter 2011 Outlook

First-quarter 2011 production volume is expected to average in the range of 390 MMcfe to 400 MMcfe per day. Average unit expenses, on a Mcfe basis, are expected as follows:

•     Lease operating expense		$.59 - $  .64
•     Gathering, processing & transportation		1.22 -   1.27
•     Production taxes		.24 -     .26
•     General and administrative		.57 -     .60
•     Depletion, depreciation & accretion		1.45 -   1.50

The company has hedges in place to cover approximately 64% of expected production for the first quarter of 2011. A total of 190 MMcf per day of natural gas is covered by collars with a weighted-average floor price of $5.95 per thousand cubic feet (Mcf) and 10,500 barrels per day of NGLs are covered by fixed-price swaps with a weighted-average price of $38.84 per barrel for the first quarter and full year of 2011.

Conference Call

The company will host a conference call to discuss fourth-quarter and full-year 2010 operating and financial results and its outlook for the future at 11:00 a.m. eastern time today.

Quicksilver invites interested parties to listen to the call via the company’s website at www.qrinc.com or by calling 1-877-313-7932, using the conference ID number 33138903, approximately 10 minutes before the call. A digital replay of the conference call will be available at 3:00 p.m. Eastern time the same day, and will remain available for 30 days. The replay can be dialed at 1-800-642-1687 and reference should be made to the conference ID number 33138903. The replay will also be archived for 30 days on the company’s website.

Use of Non-GAAP Financial Measure

This news release and the accompanying schedule include the non-generally accepted accounting principles (“non-GAAP”) financial measure of adjusted net income. The accompanying schedule provides reconciliations of this non-GAAP financial measure to its most directly comparable financial measure calculated and presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Our non-GAAP financial measure should not be considered as an alternative to GAAP measures such as net income or operating income or any other GAAP measure of liquidity or financial performance.

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About Quicksilver Resources

Fort Worth, Texas-based Quicksilver Resources is an independent oil and gas company engaged in the exploration, exploitation, development and acquisition of oil and gas, primarily from unconventional reservoirs including gas from shales, coal beds and tight sands in North America. The company has U.S. offices in Fort Worth, Texas; Glen Rose, Texas and Cut Bank, Montana. Quicksilver’s Canadian subsidiary, Quicksilver Resources Canada Inc., is headquartered in Calgary, Alberta. For more information about Quicksilver Resources, visit www.qrinc.com.

Forward-Looking Statements

# # #

Media Contact:
          Tom Johnson
          Chuck Dohrenwend
          The Abernathy MacGregor Group
          (212) 371-5999

Investor Contact:
          Rick Buterbaugh
          (817) 665-4835

KWK 11-03

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QUICKSILVER RESOURCES INC.
CONSOLIDATED STATEMENTS OF INCOME (LOSS)
In thousands, except for per share data — Unaudited

		For the Three Months Ended								For the Year Ended
		December 31,								December 31,
		2010				2009				2010				2009
Revenue
Natural gas, NGL and oil		$	224,850			$	215,542			$	856,349			$	796,698
Sales of purchased natural gas			14,062				12,473				64,089				23,654
Other			991				6,090				7,893				12,383
Total revenue			239,903				234,105				928,331				832,735
Operating expenses
Lease operating expenses			22,323				19,931				84,836				79,027
Gathering, processing and transportation expense			42,928				14,846				94,008				48,688
Production and ad valorem taxes			7,614				5,444				34,156				23,881
Costs of purchased natural gas			13,620				18,612				65,321				30,158
Other operating expenses			978				1,347				4,522				6,684
Depletion, depreciation and accretion			52,635				46,177				202,603				201,387
Impairment expense			16,466				12,414				47,997				979,540
General and administrative expense			18,362				17,791				80,107				77,243
Total expense			174,926				136,562				613,550				1,446,608
Gain on sale of KGS			473,204				—				473,204				—
Operating income (loss)			538,181				97,543				787,985				(613,873	)
Income from earnings of BBEP			(1,880	)			(1,971	)			22,323				75,444
Impairment of investment in BBEP			—				—				—				(102,084	)
Other income (expense) — net			8,078				(503	)			75,724				(1,242	)
Interest expense			(46,182	)			(45,200	)			(188,353	)			(195,101	)
Income (loss) before income taxes			498,197				49,869				697,679				(836,856	)
Income tax (expense) benefit			(181,317	)			(9,508	)			(252,886	)			291,617
Net income (loss)			316,880				40,361				444,793				(545,239	)
Net income attributable to noncontrolling interests			1,395				(7,823	)			(9,724	)			(12,234	)
Net income (loss) attributable to Quicksilver		$	318,275			$	32,538			$	435,069			$	(557,473	)
Earnings (loss) per common share — basic		$	1.87			$	0.19			$	2.56			$	(3.30	)
Earnings (loss) per common share — diluted		$	1.77			$	0.19			$	2.45			$	(3.30	)
Basic weighted average shares outstanding			170,283				169,275				170,186				169,004
Diluted weighted average shares outstanding			180,978				180,894				180,804				169,004

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QUICKSILVER RESOURCES INC.
CONSOLIDATED BALANCE SHEETS
In thousands, except share data — Unaudited

		December 31, 2010				December 31, 2009
ASSETS
Current assets
Cash and cash equivalents		$	54,937			$	1,037
Accounts receivable — net of allowance for doubtful accounts			63,380				63,738
Derivative assets at fair value			89,205				97,957
Other current assets			30,650				54,652
Total current assets			238,172				217,384
Investments in equity affiliates			83,341				112,763
Property, plant and equipment — net
Oil and gas properties, full cost method (including unevaluated costs of
$314,543 and $458,037, respectively)			2,844,919				2,338,244
Other property and equipment			222,926				204,601
Property, plant and equipment — net			3,067,845				2,542,845
Assets of midstream operations held for sale			27,178				548,508
Derivative assets at fair value			57,557				14,427
Deferred income taxes			—				133,051
Other assets			38,241				43,904
		$	3,512,334			$	3,612,882
LIABILITIES AND EQUITY
Current liabilities
Current portion of long-term debt		$	143,478			$	—
Accounts payable			167,857				149,766
Accrued liabilities			122,904				153,598
Derivative liabilities at fair value			—				395
Current deferred tax liability			28,861				51,675
Total current liabilities			463,100				355,434
Long-term debt			1,746,716				2,302,123
Liabilities of midstream operations held for sale			1,431				148,191
Asset retirement obligations			56,235				48,472
Other liabilities			28,461				20,691
Deferred income taxes			156,983				41,149
Commitments and contingencies
Equity
Preferred stock, par value $0.01, 10,000,000 shares authorized, none outstanding			—				—
Common stock, $0.01 par value, 400,000,000 shares authorized, and
175,524,816 and 174,469,836 shares issued, respectively			1,755				1,745
Paid in capital in excess of par value			714,869				730,265
Treasury stock of 5,050,450 and 4,704,448 shares, respectively			(41,487	)			(36,363	)
Accumulated other comprehensive income			130,187				121,336
Retained earnings (deficit)			254,084				(180,985	)
Quicksilver stockholders’ equity			1,059,408				635,998
Noncontrolling interests			—				60,824
Total equity			1,059,408				696,822
		$	3,512,334			$	3,612,882

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QUICKSILVER RESOURCES INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
In thousands — Unaudited

		For the Year Ended December 31,
		2010				2009
Operating activities:
Net income (loss)		$	444,793			$	(545,239	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and accretion			202,603				201,387
Impairment expense			47,997				979,540
Deferred income tax expense (benefit)			179,715				(291,414	)
Non-cash (gain) loss from hedging and derivative activities			(58,892	)			6,756
Gain on sale of KGS			(473,204	)			—
Divestiture expenses			2,555				—
Stock-based compensation			25,990				20,815
Non-cash interest expense			17,226				45,532
Gain on disposition of BBEP units			(57,584	)			—
Income from BBEP in excess of cash distributions			(1,417	)			(64,344	)
Impairment of investment in BBEP			—				102,084
Other			(168	)			747
Changes in assets and liabilities
Accounts receivable			(9,501	)			77,527
Derivative assets at fair value			30,816				54,896
Prepaid expenses and other assets			6,364				3,061
Accounts payable			33,957				(12,320	)
Income taxes payable			4,611				60
Accrued and other liabilities			1,859				33,215
Net cash provided by operating activities			397,720				612,303
Investing activities:
Purchases of property, plant and equipment			(695,114	)			(693,838	)
Proceeds from sale of KGS			699,973				—
Proceeds from sale of BBEP units			34,016				—
Proceeds from sale of properties and equipment			9,953				220,974
Net cash provided (used) by investing activities			48,828				(472,864	)
Financing activities:
Issuance of debt			690,058				1,420,727
Repayments of debt			(1,031,736	)			(1,649,630	)
Debt issuance costs paid			(3,111	)			(32,472	)
Gas Purchase Commitment assumed			—				58,294
Gas Purchase Commitment repayments			(44,119	)			(14,175	)
Issuance of KGS common units — net of offering costs			11,054				80,729
Distributions paid on KGS common units			(13,550	)			(9,925	)
Proceeds from exercise of stock options			1,801				4,046
Excess tax benefits on exercise of stock options			3,513				—
Taxes paid on vesting of KGS equity compensation			(1,144	)			(63	)
Purchase of treasury stock			(4,910	)			(922	)
Net cash provided (used) by financing activities			(392,144	)			(143,391	)
Effect of exchange rate changes in cash			(1,252	)			2,889
Net increase (decrease) in cash			53,152				(1,063	)
Cash and cash equivalents at beginning of period			1,785				2,848
Cash and cash equivalents at end of period		$	54,937			$	1,785

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QUICKSILVER RESOURCES INC.
Unaudited Selected Operating Results

		Three Months Ended December 31,								Year Ended December 31,
		2010				2009				2010				2009
Average Daily Production:
Natural Gas (Mcfd)			312,050				244,621				278,532				235,725
NGL (Bbld)			12,095				12,331				11,946				13,635
Oil (Bbld)			766				955				830				1,165
Total (Mcfed)			389,214				324,337				355,185				324,526
Average Realized Price:
Natural Gas (per Mcf)		$	6.38			$	7.46			$	6.86			$	7.42
NGL (per Bbl)		$	32.46			$	36.60			$	31.46			$	27.32
Oil (per Bbl)		$	77.16			$	68.79			$	71.90			$	51.85
Total (Mcfe)		$	6.28			$	7.22			$	6.61			$	6.73
Expense per Mcfe:
Lease operating expense:
Cash expense			0.60				0.65				0.63				0.64
Equity compensation			0.02				0.02				0.02				0.03
Total lease operating expense		$	0.62			$	0.67			$	0.65			$	0.67
GPT expense		$	1.20			$	0.50			$	0.73			$	0.41
Production and ad valorem taxes		$	0.21			$	0.18			$	0.26			$	0.20
Depletion, depreciation and accretion		$	1.47			$	1.55			$	1.56			$	1.70
General and administrative expense:
Cash expense		$	0.31			$	0.46			$	0.43			$	0.47
Litigation settlement			—				—				0.02				0.04
Equity compensation			0.20				0.14				0.17				0.14
Total general and administrative expense		$	0.51			$	0.60			$	0.62			$	0.65

QUICKSILVER RESOURCES INC.
Production, on a million cubic feet of natural gas equivalent (MMcfe) per day basis, by operating area

		Three Months Ended December 31,												Year Ended December 31,
		2010				2009				Change				2010				2009				Change
Barnett Shale			309.3				251.0				23	%			281.9				254.2				11	%
Other U.S.			3.4				3.9				(13	)%			4.1				3.4				21	%
Total U.S.			312.7				254.9				23	%			286.0				257.6				11	%
Horseshoe Canyon			62.8				63.8				(2	)%			61.2				64.9				(6	)%
Horn River			13.7				5.6				145	%			8.0				2.0				300	%
Total Canada			76.5				69.4				10	%			69.2				66.9				3	%
Total Company			389.2				324.3				20	%			355.2				324.5				9	%

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QUICKSILVER RESOURCES INC.
RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED NET INCOME
In thousands, except per share data — Unaudited

		Three Months Ended December 31,								Year Ended December 31,
		2010				2009				2010				2009
Net income (loss)		$	318,275			$	32,538			$	435,069			$	(557,473	)
Adjustments
Gain on sale of KGS			(473,204	)			—				(473,204	)			—
Impairment of assets			16,466				12,414				47,997				979,540
Impairment of investment in BBEP			—				—				—				102,084
Crestwood Transaction expenses			2,186				—				4,746				—
Equity portion of BBEP impairment of E&P properties			—				—				—				35,044
Equity portion of early settlement of hedges from BBEP			—				—				—				(28,602	)
Equity portion of interest rate derivatives from BBEP			(429	)			1,534				(1,964	)			8,375
Equity portion of commodity derivatives from BBEP			9,978				4,707				7,099				(73,956	)
Equity portion of (gain) loss from sale of properties from BBEP			(117	)			2,213				262				2,213
BBEP settlement			—				—				(18,000	)			—
Gain on BBEP units sold and conveyed			(7,734	)			—				(57,584	)			—
Unrealized valuation gain on Gas Purchase Commitment			(666	)			—				(6,625	)			—
Debt termination-related expenses			—				—				—				27,122
Legal settlement			250				—				2,650				5,000
Total adjustments before income tax expense			(453,270	)			20,868				(494,623	)			1,056,820
Income tax expense for above adjustments			165,022				(6,062	)			179,495				(350,958	)
Total adjustments after tax			(288,248	)			14,806				(315,128	)			705,862
Adjusted net income		$	30,027			$	47,344			$	119,941			$	148,389
Adjusted net income per common share — Diluted		$	0.18			$	0.27			$	0.70			$	0.86
Diluted weighed average common shares outstanding			180,978				180,894				180,804				179,617

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