Mr Bratley, who is a West Auckland lawyer, said he was unaware of exactly how many clients the company had. However, business had been booming, he said.
The company was founded less than a year ago and also has links to an Auckland accountant, Robert Kairua.
US federal authorities have accused Mr Geldman, together with another man, of "participating in a conspiracy", including forging signatures and falsely identifying themselves as a securities broker and a "comptroller of a legitimate company" to entice investors to give them money.
The pair are said to have falsely advertised in a US newspaper that they could deliver a 12 per cent annual return on investors' money. According to the Florida Sun-Sentinel, they face up to five years in prison if convicted.
When confronted about the charges last week, Mr Geldman told the Herald they related to things he had done "many years ago" and now regretted. He said he had turned himself in to the authorities after becoming a Christian, and would resign from Bullion Buyer if the company wanted him to.
Four days later, Bullion Buyer confirmed he was leaving "by mutual agreement".
Mr Bratley said the company was determined to stay in business and was in the process of hiring a new bullion trader. At no stage did Mr Geldman have personal access to clients' money, and all their investments were safe.
However, rival bullion traders fear the publicity will revive public concerns about the unregulated industry, more than 20 years after the collapse of 80s high-flyer Goldcorp.
The Financial Markets Authority said it was aware of complaints about precious metals dealers, but has noted that the industry does not come under its jurisdiction.
However, proposed legislation that is currently before Parliament may give it new powers that would enable it to "call in" investments it has concerns about.
Uncertainty about the future of the US and European economies has pushed the price of gold to record levels this year, prompting a surge of interest in precious metals as an investment.
Demand has been so great that one local company, New Zealand Mint, has been struggling to meet orders.
New Zealand Mint's head bullion dealer, Mike O'Kane, said he was keen to see stricter regulation of the sector.
In the past few weeks, the industry had gone "absolutely nuts", he said.