Brian Tooley

Brian Tooley

Main: 303-830-2500
Direct: 303-376-4475
Licensed in: Colorado

OverviewExperience & ResultsPractice AreasHonors & InsightsEducation & Admissions

Brian is a highly experienced litigator and trial lawyer, with more than 30 years’ of success for clients in resolving and preventing disputes in business, real property, natural resources and commercial matters, including arbitrations, trials and appeals.

He regularly litigates or arbitrates contract and business disputes involving a wide variety of subject matters – including disputes involving real property transactions, development and joint venture agreements, land use, corporate and partnership matters, mineral rights, anti-trust claims, class actions, governmental regulation and agency action, business torts, construction claims, oil and gas operations, mining, employment, and a variety of other business disputes.

Experience & Results

Joint Ventures, Development Agreements & Business Torts

  • Riviera Drilling & Exploration Co. v. Gunnison Energy Corp., et al., 412 Fed.Appx. 89 (C.A.10 2011) (exploration corporation’s antitrust action dismissed against energy companies).
  • Gunnison Energy Corporation v. SG Interests I, Ltd., District Court, Gunnison County, Colorado, Case No. 2011CV262 (dispute over operatorship of an $80 million natural gas pipeline).
  • Mountain Petroleum Corporation et al. v. Foundation Energy Management, LLC, Case No. 2015CV030304, Denver District Court (2015) (Defended claim seeking over 8 million in damages for alleged tortious interference with prospective purchase and sale agreement and dispute over attempted sale of the right of operatorship of 285 natural gas wells in Yuma County, Colorado).
  • Enerplus Resources (USA) Corp. v. Slawson Exploration Company, Inc., (AAA 2006) (obtained arbitration award on behalf of defendant on all claims concerning area of mutual interest agreement covering Bakken play in Montana).
  • Edwards Energy Corp. v. Enervest Management Partners, LTD., U.S. Dist. Colo., Case No. 02-MK-0893 (2002) (dispute over joint venture agreement, title, accounting and back-in working interests).
  • San Juan Basin Consortium, Ltd v. EnerVest San Juan Acquisition Ltd., 67 F.Supp.2d 1213 (D. Colo. 1999) (successfully defended claims re: back-in reversionary interest at payout involving Section 29 tax credits).
  • Encana Oil & Gas (USA), Inc. v. QEP Energy Company and True Oil LLC, Sweetwater County District Court, Wyoming. Case C-10-505-R. (breach of contract action over right to convert overriding royalty interest to working interest at payout).

Construction/Real Estate

  • Encore 7074, LLC v. Westerman Realty Interests, Arapahoe County District Court, Case No.: 15 CV 23299 (successful jury verdict for defendant on claims for alleged failure to disclose defects in connection with a sale of commercial office building)
  • Golden Eagle Exploration, LLC v. Weatherford U.S., L.P., Case No. 0707-119, Grand County, Utah (2007) (multi-million dollar claims arising out of failure to properly hang liner, leading to cementation of 2,000’ of drill pipe and four months of milling and fishing operations).
  • Rippy v. SG Interests I, Ltd., District Court, Mesa County, Colorado, Case No. 2010CV4164 (defense of action brought by rancher alleging trespass and breach of natural gas pipeline easement agreement; obtained jury verdict in favor of defendant on all claims and an award of $986,262 for damages and attorney fees on defendant’s counterclaims for interference with pipeline construction operations).
  • Petrogulf Corporation v. Northern Production Co. Inc., Case No. 03CV1762, Denver District Court, (2003) (claims against drilling contractor for dropping over 4,000 feet of tubing which caused it to cork screw and destroy the well).
  • J.W. Gibson v. Murfin Drilling Co., Case No. 98 S 2183, Denver District Court (claims against drilling contractor for negligence and breach of contract involving lost mud circulation and stuck drill string).
  • DIA construction claims. Represented various clients on bid protests, payment claims and contract disputes in connection with the construction of Denver International Airport.
  • Reef USA Fund III v. Macerich Management Co., Denver District Court. (Represented manager of shopping mall in multiple claims involving disturbance of asbestos during renovation of the shopping mall).
  • Scott Company of California v. M.K. Ferguson, 832 P.3d 1000 (Colo. 1991) (jury verdict for subcontractor on delay impacts and overruns for work in constructing the Anheuser-Busch Brewery in Fort Collins).

Oil and Gas Leases

  • BP America Production Company v. Southland Royalty Company, LLC, Sweetwater County, WY, Civil Action C-17-313-J)(dispute over obligation to compel release of over 26,000 acres of oil and gas leases in the Wamsutter Wyoming field; obtained partial summary judgment on counterclaims requiring release of each aliquot section not capable of producing in paying quantities; case still pending).
  • WEP Transport Holdings, LLC et al v. Bison Oil & Gas, LLC et al, Adams County District Court, Case No. 2017CV30269 (Successfully secured dismiss of fraud, breach of contract and anti-trust claims asserted against co-defendant client)
  • Rock Creek Ranch, Ltd. v. Riviera Drilling and Exploration, Co., 2010 WL 3036515 (Colo. App. 2010) (obtained judgment for landowner terminating oil and gas lease for failure to timely develop and an award of attorney’s fees, affirmed on appeal).
  • CC Karval Cattle Company, L.P. v. Fossil Creek Resources, L.L.C., Lincoln County District Court, Case No. 2013CV20 (Successfully defended oil and gas lessee in actions seeking declaration of lease termination).
  • Bolton v. Renegade Oil & Gas Company, LLC, Kiowa County District Court, Case No. 2013CV30003. (Successfully defended claim seeking to terminate oil and gas lease for failure to produce in paying quantities).
  • United Dairy Farmers, Inc. v. BP American Production Company, U.S. District Court, Civil Action No. 06CV2536, U.S. Dist. Colo. (2006) (claim against lessee for breach of implied covenant to protect against drainage).

Government Agencies and Regulations

  • Western Energy Alliance v. Salazar, 2011 WL 3737520 (D. Wyo. 2011) (judgment requiring Secretary of Interior to make lease issuance decisions within 60 day period mandated by Congress under the Mineral Leasing Act).
  • SG Interests v. Board of County Commr’s of Gunnison County, Colorado (Gunnison County District Court, 2011) (challenge to legality of county oil and gas regulations and preemption of local regulations after COGCC’s overhaul of state oil and gas regulations).
  • In re: BP America Production Company for Involuntary Pooling, Colorado Oil and Gas Conservation Commission, Cause No. 112, Docket No. 1010-U-57 (successfully opposed application seeking retroactive force pooling for wells governed by communitization agreement with the Southern Ute Indian Tribe).

Royalty Disputes

  • Mountain West Exploration, Inc. et. al. v. Evergreen Resources, Inc., Case No. 02CV8854, Denver District Court (2002) (Defense of multi-million dollar class action lawsuit for alleged underpaid royalties, successfully settled during class certification proceedings).
  • Rogers v. Westerman Farm Co, 986 P.2d 967 (Colo. App. 1998), rev’d and remanded 29 P.3d 887 (Colo. 2001) (defended royalty underpayment claims involving 223 natural gas wells in Yuma County, Colorado. After favorable jury verdict and court of appeals decision, favorably settled after Colorado Supreme Court remanded for new trial).
  • Encana Oil & Gas (USA) Inc. v. Sally Miler et al., Denver District Court, Case No. 2016CV031444. (suit challenging whether class action royalty settlement agreement authorizes subsequent class wide arbitration).
  • Federal, State, and Indian Royalty Audits and fee royalty disputes. Represented numerous clients in defending royalty audits by ONRR/MMS, State of Colorado and Indian Tribes, and class and individual arbitration and litigation over alleged underpaid oil and gas royalties.

Title, Trespass, Surface Use

  • Schares v. Renegade Oil & Gas Co., L.L.C., 2008 WL 4292664 (Colo. App. 2008), cert denied, 2009 WL 1041496 (Colo. 2009) (obtained dismissal of surface owner trespass claim and an award of attorney fees against surface owner, affirmed on appeal).
  • Comet Energy Services, LLC v. Powder River Oil & Gas Ventures, LLC, 239 P.3d 382 (Wyo. 2010) (cleared title to oil and gas leasehold interests purchased at auction).
  • Newton v. Morrison, 2009 WL 1555447 (Colo. App. 2009) (successful trial judgment after remand establishing ownership of disputed minerals).
  • Steiner v. Pioneer Natural Resources (USA) Inc., Case No. 03CV143, Las Animas County District Court (injunction hearing and obtained order against surface owners enjoining them from interfering with access, surface use and operations).
  • Petrogulf Corp. v. Arco Oil & Gas Co., 92 F. Supp. 2d 111 (D. Colo. 2000) (mineral trespass dispute over the location and drainage of gas well drilled on fee lands within Southern Ute Indian Reservation).
  • Mining
  • DynaResources de Mexico, S.A. de C.V. et al. v. Goldgroup Resources, Inc., U.S. District Court, Civil Action No. 14-cv-01527, and International Centre for Dispute Resolution, ICDR 50 501 T 00226 14. (Represented Mexican gold mining company in dispute over ownership and control of gold mine under an Earn/In Agreement dealing with Mexican law and challenge to the scope of claims subject to arbitration under the Panama Convention).
  • Utah Energy Corp. v. Lammert, Civil No. 0807-59, San Juan County, Utah (2009) (title and partnership dispute over uranium mining claims near Moab, Utah).
  • Bar Nothing Ranch, L.L.C. v. Febraro Construction Company, Las Animas County, Colo. (Claim by owner over gravel pit operations, accounting and termination of gravel pit lease).
  • Western Hog Ranch v. Western Mining Corporation, D. Nev. 1999 (dispute over reclamation of gold mine in Nevada).
  • Represented numerous clients concerning validity and disputes over mining claims and mining operations and in evaluating pending litigation and claims as part of due diligence in acquisition of mining claims and assets.


  • Wimmer v. City of Aurora, Civil Action No. 96-N-1547 (D. Colo. 2006) (jury verdict against City of Aurora, Aurora Chief of Police, individually, and Aurora Deputy Chief of Police, individually, under American with Disabilities Act and outrageous conduct claims).
  • Eric Knight v. Excell Energy, LLC, Case No. 1:15-cv-02456, U.S. District Court for the District of Colorado (successfully defended oil and gas company in class action alleging violation of the Worker Adjustment and Retraining Notification Act of 1988 in connection with alleged mass layoff of oilfield workers).
  • Represented numerous employers and employees in disputes over wages, ownership interests, non-compete agreements, misappropriation of trade secrets, discrimination and wrongful termination claims.
Practice Areas
  • Complex Commercial Litigation
  • General Civil Litigation
  • Trials and Appeals
  • Mediation & Arbitration
  • Business Contracts & Torts
  • Real Property Litigation
  • Oil & Gas Conservation Commission and Regulatory
  • Oil & Gas Litigation
  • Natural Resources
  • Construction
  • Employment
  • Public Lands
  • Mining
  • Eminent Domain
  • Appeals
  • Trial
Honors & Insights
  • Listed by Lawdragon as one of the “500 Leading U.S. Energy Lawyers” in 2023
  • Top Lawyers, Civil Litigation, 5280 – The Denver Magazine, 2017
  • Board of Directors, Denver Mountain Parks Foundation, 2016-2021
  • Selected to Colorado Super Lawyers, 2009-2023
  • Selected for Inclusion in The Best Lawyers in America© in the fields of Natural Resources Law, 2013-2019, 2021-2024 and Commercial Litigation, 2015-2019, 2021-2024
  • Co-author of “The Marketable Product Approach in the Natural Gas Royalty Case,” 44 Rocky Mt. Min. L. Inst. 21-1 (1998)
  • Adjunct Professor of Oil and Gas Law at the University of Denver Law School (1998)
  • Av rated by Martindale Hubbell
  • Phi Beta Kappa Society
  • Frequent Lecturer, various continuing legal education seminars, professional associations, and University of Denver School of Law
  • J.D., University of Colorado at Boulder, Order of the Coif, 1988
  • B.A., University of Colorado at Boulder, with distinction, 1984
Bar Admissions / Qualifications
  • Colorado, 1988
  • U.S. District Court, District of Colorado
  • U.S. Court of Appeals, Tenth Circuit
  • U.S. Court of Federal Claims
  • South Ute Indian Tribal Court through 2015
  • Admitted pro hoc vice in numerous cases in Wyoming and Utah