Exhibit 5.1
                        [LETTERHEAD OF LOEB & LOEB LLP]


WRITER'S DIRECT DIAL NUMBER

213-688-3698
                                  
                              July 28, 1997     


Board of Directors
Casmyn Corp.
1500 West Georgia Street, 18th Floor
Vancouver, B.C.  V6G 2Z6

          Re:  Registration Statement on Form S-3
               ----------------------------------

Gentlemen:
        
          We have acted as counsel to Casmyn Corp., Inc., a Colorado corporation
("Company"), in connection with the preparation and filing with the Securities
and Exchange Commission (the "Commission") under the Securities Act of 1933, as
amended (the "Act"), of the Company's registration statement on Form S-3
(together with all amendments, the "Registration Statement").  The Registration
Statement relates to the registration under the Act of 7,047,958 shares of the
Company's common stock ("Common Stock").     

          In rendering this opinion, we have reviewed the Registration
Statement, as well as a copy of the Company's Articles of Incorporation and
Bylaws, each as amended to date.  We have also reviewed such documents and such
statutes, rules and judicial precedents as we have deemed necessary for the
opinions expressed herein.

          In rendering this opinion, we have assumed the genuineness of all
signatures, the legal capacity of natural persons, the authenticity of documents
submitted to us as originals, the conformity to original documents of documents
submitted to us as certified or photostatic copies, and the authenticity of
originals of such photostatic copies.

          Based upon and in reliance upon the foregoing, and subject to the
qualifications and limitations herein set forth, we are of the opinion that the
shares of Common Stock have



 
Board of Directors
Casmyn Corp.
        
July 28, 1997      
Page 2



been duly and validly authorized and, when sold, will be legally issued, fully
paid and nonassessable.

          This opinion is limited to the corporate law of Colorado, and we
express no opinion with respect to the laws of any other jurisdiction.

          We consent to the filing of this opinion with the Commission as an
exhibit to the Registration Statement.
    
          This opinion may not be used, circulated, quoted or otherwise referred
to for any purpose without our prior written consent and may not be relied upon
by any person or entity other than the Company, its successors and assigns, and
investors in this Offering. This opinion is based upon our knowledge of law and
facts as of its date. We assume no duty to communicate to you with respect to
any matter which comes to our attention hereafter.      

                                           Sincerely,

                                           LOEB & LOEB LLP



                                           By /s/ David L. Ficksman
                                             ----------------------
                                             A Partner of the Firm