(6) That the Purchaser or the persons deriving title under the Purchaser will at all times from the date hereof duly pay all rents, royalties and payments becoming due under the (four) hereinbefore recited Indenture of Lease (,subject as regards the Limestone lease to the modifications effected by the agreement for 508 reduction of royalty dated the thirtieth day of September one thousand nine hundred and thirty four hereinabove recited) in respect of the premises agreements options rights or benefits hereby assigned and transferred and observe and perform the covenants agreements stipulations and conditions therein contained and henceforth on the part of the Lessee or grantee to be observed and performed in respect of the aforesaid premises or under the said Bauxite agreement or under the said Tori Option agreement or under the said agreement for reduction of royalty And also will at all times from the date hereof save harmless and keep indemnified the Vendor its successors and assigns from and against all proceedings costs claims and expenses on account of any omission to pay the said rent, royalty or payments or any breach of any of the said covenants agreements stipulations and conditions.