PPR has petitioned the Supreme Court of Western Australia to wind up the companies, with a hearing scheduled for September 15.
After some backroom discussions Landau has apparently agreed to a process where the application will be withdrawn.
Black Mountain and Citation have terminated their agreements with PPR, and will sign a new PR firm.
PPR executive director Peter Harris told Energy News the legal action relates to long outstanding debts owed by Citation and Black Mountain.
"PPR is hopeful the outstanding debts will be paid prior to Tuesday, September 15," he said.
Harris did not want to discuss the size of the debts.
Citation has oil and gas interest in Guatemala and Texas, both projects associated with Landau's former flagship, Range Resources, although more recently it has considered an investment in a technology to turn waste tyres into liquid fuels, for which it intends to raise $6.1 million this month.
Citation had just $449,000 in cash at the end of the last quarter and debts of $1.75 million.
Black Mountain, which cancelled its listing on London's Alternative Investment Market earlier this year, is seeking to raise up to $6.8 million for drilling of its Conjecture silver project in the US and to take a 20% stake in a speculative salvage operation, looking to recover gold and silver believed to be in two World War One shipwrecks off the coast of Ireland.
Its New Departure silver mine is on care and maintenance due to the low silver price.
Black Mountain had just $67,000 in cash at the end of the last quarter.
Laundu's Okap Capital has a stable of other troubled resources companies: Continental Coal, Ausroc Metals and Kaboko Mining, all of which are suspended from trading on the Australian Securities Exchange.
Okap also has a relationship with International Goldfields, a company making a move into the hemp and cannabis business. PPR national director David Tasker, formerly Landau's main PR contact, is a director of that company.
