When they are horizontal the term manto is used to describe a tubular ore body. Examples diamonds in a kimberlite or copper ore in a porphyry copper deposit. Mineralization of this type is gradational and assay wall cutoff grades are the norm. Overall shape of the deposit is usually roughly cylindrical. Often occur in sedimentary rocks.
Example skarn deposits where ore lies at the intrusive-sedimentary contact.
Have very irregular shape with the shape often constrained by changes in host lithology. Another example is Mississippi Valley Type deposits that often result from the irregular replacement of carbonates beneath some solution impervious cap-rock such as a shale. Sedimentary host rocks - Concordant with bedding, extensive in two dimensions and restricted in the third. Example is the replacement of the Dolomite Breccias from the Silvermines Ireland. Examples are the Kupferschiefer of Central Europe and Sullivan, British Columbia.