Ann: Fifth Hole at Andover Continues to Impress, page-89

Massive and semi-massive ores fall into five major categories (Table3):
1. Pure inclusion-free massive sulfide ores;
2. Emulsion textured ores formed by frozen mixtures of molten silicate and sulfide, most commonly developed as melt films at thermal erosion contacts;
3. Sulfide matrix ore breccias, of sharp-wall, soft-wall or mixed character,developed by flooding of percolating sulfide matrix through the matrix of original silicate-melt-matrix intrusion breccias;
4. Vein-hosted sulfides formed at late magmatic or high temperature post-emplacement deformation stage close to the brittle-ductile transition in the country rocks or host igneous bodies; closely spaced intersecting vein arrays may produce the appearance of sulfide-matrix breccias in drill core;
5. Tectonic “durchbewegung” breccias, formed in the solid state by mechanical inter-shearing of silicate inclusions and weak, ductile solid sulfides.

https://www.researchgate.net/profile/Stephen_Barnes/publication/326980292_Sulfide-silicate_textures_in_magmatic_Ni-Cu-PGE_sulfide_ore_deposits_Massive_semi-massive_and_sulfide-matrix_breccia_ores/links/5c3c31cc299bf12be3c6587e/Sulfide-silicate-textures-in-magmatic-Ni-Cu-PGE-sulfide-ore-deposits-Massive-semi-massive-and-sulfide-matrix-breccia-ores.pdf?origin=publication_detail