It is always a challenge trying to find information in the early days of a land rush.  One way to track what companies are getting leases and where is the county clerk's public records.  It's easy to do and can be done in person or online with a remote access subscription.  Lessees (the company or individual taking the lease) will want to record a memorandum of lease in the public record but don't expect them to rush to record each lease.  Typically lessees will record their leases in batches periodically.  It's early so there may not be any recorded but at some point in the not too distant future there should be a batch available.  The memorandum of lease will give only the bare bones information.  The lessor (the person leasing their mineral rights), the lessee, the location and the term or length of time for which the lease is in effect.  At some point, there should be competition for brine leases.  Competition always serves to improve the terms offered to mineral owners.  Knowing which companies are competing for leases provides an advantage for mineral owners to negotiate their best deal.