The improvement of blast-furnace technology continued to hold his interest, and in 1971 he published "Theory of cold blast iron production with stackgas of low nitrogen content". The ideas in this paper were regarded as a realistic solution to the nagging problem of a shortage of local reserves of coking coal, and outlined ideas for producing ferro-alloys of lower melting points. Bleloch was elected a President of The South African Institute of Mining and Metallurgy for the year 1956-1957.