|Mineral Interest||Royalty Interest||Overriding Royalty Interest||Non-Operated Working Interest|
|Receives Royalty Payments||No||Yes||Yes||Yes|
|Ownership of Underground Minerals||Yes||Yes||No||No|
|Has Rights to Execute Leases||Yes||Yes||No||No|
|Collects Upfront Bonus Payments||Yes||No||No||No|
|Duration||Perpetual||Perpetual, unless otherwise stated in the lease.||Created out of the working interest. Interest terminates upon lease expiration unless otherwise stated in the lease.||Interest terminates upon lease expiration.|
|Liability to Government||None||None||None||Unlimited, even after lease expiration.|
|Drilling Costs Liability||None||None||None||Several liabilities, with each interest owner responsible for their proportionate share.|
|Property or Subsurface Damage Liability||None||None||None||Several liabilities, with each interest owner responsible for their proportionate share, subject to insurance coverage.|
|Upside||Receives share of proceeds when a producing well is successfully drilled on the mineral interest. This payment is in the form of royalty interest.||If additional wells are drilled on the lease, the royalty owners receive their share of the proceeds from the sales of production and bear no additional cost.||None||None|
Cornerstone's primary office is located in Rancho Santa Fe, CA.
Cornerstone controls the following entities:
Cornerstone Acquisition & Management Company, LLC is the Investment Manager of the Caritas Funds, a set of investment funds that focus on U.S. based oil and natural
gas mineral interests, royalty interests, overriding royalty interests, and non-operated working interests. Acquired properties and other energy-related investments are added to the Caritas
investment portfolio on a regular basis.
Cornerstone represents a diverse group of investors from around the world who wish to participate in the U.S. energy markets. To learn more, please visit the Caritas Funds website and/or contact our Marketing & Investor Relations Department at .