Modern research on macromolecular humus has revealed the binding capacity of this type of humus towards heavy metal ions. While humic substances are active in the freeing and uptake of such metal ions from disintegrating rocks, deposition of these ions will result from the contact between the metal-humate complexes and microbially generated hydrogen sulfide. Such a process of deposition of metal sulfides in marine sediments could have been the main factor in the creation of certain geological so-called stratiform sulfide ore formations of considerable economic importance. In order to study the mechanisms involved in more detail, artificial metal-humates were made. Two types of natural humus (“aqua humus” and “sulfite humus”) were selected for their sorption capacity. Metal-humate complexes were made by adding pure metal powders in different quantities to various humus suspensions, while air was expelled by bubbling nitrogen gas through the flasks. After thorough contact the suspensions were filtered and measured for their metal concentrations with the aid of X-ray fluorescence. Metal sulfides were created by percolating hydrogen sulfide gas through the metal-humate suspensions under controlled circumstances. Precipitated metal sulfides were collected in media such as filter paper, glass beads, silica gel, quartz sand, porous glass, or clay. X-ray identification to the sulfides formed was employed. Unprecipitated metal humates were measured from the remaining suspensions with X-ray fluorescence analysis. Apart from conclusions in regard to the sorption mechanisms involved, conclusions on environmental factors required for this type of mineral deposition, as well as conclusions on morphological aspects of microscopic sulfide spherules (“framboidal textures”) found in recent and fossil marine sediments, are drawn from the laboratory observations described.