GHANA CONSOLIDATED DIAMONDS LTD v. BOAHENE AND ANOTHER Concessions—Variation of certificate of validity—Meaning of—Certificate of validity limiting usage of  "fetish lands"—Protracted dispute between stool and GCDL over extent of fetish lands—Overlord of stool joining parties in 1952 in agreement defining extent of fetish lands—Previous correspondence between disputants withdrawn as part of agreement—Whether agreement constituting modification or variation of limitations and conditions imposed by court under Cap. 136, s. 13 (8) and (9) regarding fetish lands or of area recognised by parties as fetish lands—Whether parties to have complied with procedure under Cap. 136, s. 34 for variation of certificate of validity for agreement to be effective—Concessions Ordinance, Cap. 136 (1951 Rev.), ss. 13 (8) and (9) and 34.