EXHIBIT 99
     
     
     CAUTIONARY FACTORS THAT MAY AFFECT FUTURE RESULTS
     
     
          The disclosure and analysis set forth in this
     quarterly report on Form 10-Q contain certain 
     forward-looking statements, particularly statements 
     relating to future actions, performance or results of
     current and anticipated products, sales efforts,
     expenditures, and financial results. From time to time, the
     Company also provides forward-looking statements in other    
     publicly-released materials, both written and oral.       
     Forward-looking statements provide current expectations or
     forecasts of future events such as new products,
     revenues and financial performance, and are not limited
     to describing historical or current facts.  They can be
     identified by their use of words such as "plans,"
     "expects," "anticipated," "will" and other words and
     phrases of similar meaning.
     
          Forward-looking statements are necessarily based
     on assumptions, estimates and limited information
     available at the time they are made.  A broad variety
     of risks and uncertainties, both known and unknown, as
     well as the inaccuracy of assumptions and estimates,
     can affect the realization of the expectations or
     forecasts in these statements.  Consequently, no
     forward-looking statement can be guaranteed.  Actual
     future results may vary materially.
     
          The Company undertakes no obligation to update any
     forward-looking statements.  You should refer to the 
     Company's subsequent filings under the Securities 
     Exchange Act of 1934 for further disclosures.
     
          As permitted by the Private Securities Litigation
     Reform Act of 1995, the Company is providing the
     following cautionary statements which identify factors
     that could cause the Company's actual results to differ
     materially from historical and expected results.  It is
     not possible to foresee or identify all such factors. 
     You should not consider this list an exhaustive
     statement of all potential risks, uncertainties and
     inaccurate assumptions.
     
     --  HISTORICAL GROWTH RATE
         Continuance of the historical growth rate of the    
         Company depends upon a number of uncertain          
         events, including the outcome of the         
         Company's strategies of increasing its penetration  
         into geographical markets such as Asia, Latin       
         America and Europe; increasing its penetration into 
         product markets such as the market for paper        
         coating pigments and the market for groundwood paper
         pigments; increasing sales to existing PCC  
         customers by increasing the amount of PCC used in   
         each ton of paper produced; and developing,         
         introducing and selling new products. Difficulties, 
         delays or failures of any of these strategies could 
         cause the future growth rate of the Company to      
         differ materially from its historical growth rate.
     
     --  CONTRACT RENEWALS
         The Company's sales of PCC are predominantly        
         pursuant to long-term agreements, generally ten     
         years in length, with paper mills at which the      
         Company operates satellite PCC plants.  The terms   
         of many of these agreements have been extended,     
         often in connection with an expansion of the        
         satellite PCC plant.  To date, the Company's        
         experience with extensions and renewals of its      
         satellite PCC agreements has been favorable.  There 
         is no assurance, however, that this will continue   
         to be the case.  Failure of a number of the 
         Company's customers to renew existing agreements 
         could cause the future growth rate of the Company
         to differ materially from its historical growth
         rate, and could have a substantial adverse effect
         on the Company's results of operations.
     
     --  LITIGATION; ENVIRONMENTAL EXPOSURES
         The Company's operations are subject to             
         international, federal, state and local             
         environmental, tax and other laws and regulations,  
         and potentially to claims for various legal,        
         environmental and tax matters.  The Company is      
         currently a party to various litigation matters,    
         including the Eaton litigation which has previously 
         been disclosed in the Management's Discussion and   
         Analysis sections of the Company's most recent      
         filings under the Securities Exchange Act of 1934.  
         While the Company carries liability insurance which 
         it believes to be appropriate to its businesses,    
         and has provided reserves for such matters which it 
         believes to be adequate, an unanticipated liability 
         arising out of such a litigation matter or a tax or 
         environmental proceeding could have a material      
         adverse effect on the Company's financial condition 
         or results of operations.
     
     --  NEW PRODUCTS
         The Company is engaged in a continuous effort to    
         develop new products in all of its product lines.   
         Difficulties, delays or failures in the  
         development, testing, production, marketing and     
         sale of such new products could cause the Company's
         actual results of operations to differ materially
         from expected results.
     
     --  COMPETITION; PROTECTION OF INTELLECTUAL PROPERTY
         Particularly in its PCC and Refractory product      
         lines, the Company competes based in part upon      
         proprietary knowledge, both patented and            
         unpatented.  The Company's ability to achieve       
         anticipated results depends in part on its ability  
         to defend its intellectual property against         
         inappropriate disclosure as well as against         
         infringement. In addition, development by the 
         Company's competitors of new products or 
         technologies that are more effective or less
         expensive than those the Company offers could have
         a material adverse effect on the Company's 
         financial condition or results of operations.
         
     --  RISKS OF DOING BUSINESS ABROAD
         As the Company expands its operations overseas, it  
         faces the increased risks of doing business abroad, 
         including inflation, fluctuations in interest rates 
         and currency exchange rates, nationalization,       
         expropriation, limits on repatriation of funds,     
         unstable governments and legal systems, and other   
         factors.  Adverse developments in any of these      
         areas could cause actual results to differ          
         materially from historical and expected results.
     
     --  AVAILABILITY OF RAW MATERIALS
         The Company's ability to achieve anticipated        
         results depends in part on having an adequate       
         supply of raw materials for its manufacturing       
         operations, particularly lime and carbon dioxide    
         for PCC operations and magnesia for refractory      
         operations, and on having adequate access to the
         ore reserves at its mining operations.  Unanticipated
         changes in the costs or availability of such raw
         materials, or in the Company's ability to have
         access to its ore reserves, could adversely affect 
         the Company's results of operations.