code: function readMinerDeposit( sSuperNodeAddress, pfnCallback )
  {
  	readMinerAddress( sSuperNodeAddress, function( err, sMinerAddress )
  	{
  		if ( err )
  		{
  			return pfnCallback( err );
  		}
  
  		//
  		//	query deposit
  		//
  		let nDeposit	= 0;
  
  		//	...
  		return pfnCallback( null, nDeposit );
  	});
  }
docs: read miner deposit
  @param	{string}	sSuperNodeAddress
  @param	{function}	pfnCallback( err, nDeposit )