A minelayer is any warship, submarine, military aircraft or land vehicle that is capable of deploying explosive mines. Since World War I, the term "minelayer" refers specifically to a naval ship used
Canadian sailors with a mine aboard the minelayer HMCS Sankaty off Halifax, Nova Scotia in World War II.
Amiral Murgescu of the Romanian Navy, a successful World War II minelayer that was also employed as a destroyer escort
Swedish minelayer Älvsborg (1974)
Finnish Navy Hämeenmaa-class minelayer FNS Uusimaa
Mine planter and the earlier "torpedo planter" was a term used for mine warfare ships into the early days of World War I. In later terminology, particularly in the United States, a mine planter was a
Minelayer
…army's special-purpose combat engineering vehicles used to lay landmines are sometimes called "minelayers". Before World War I, mine ships were termed mine planters generally. For example, in an address to the United States Navy ships of Mine Squadron One at Portland, England, Admiral Sims used the term "mine layer…
Army M 1 Mine Planter "Hull No. 480", USAMP MP-7 Major General Wallace F. Randolph. Records (#742), Special Collections Department, J. Y. Joyner Library, East Carolina University, Greenville, North Carolina, US.
USAMP Major Samuel Ringgold, built 1904 (National Archives and Records Administration)
U.S. Army Mine Planter, Ellery W. Niles, Enroute Down the Potomac to Fort Monroe, Virginia (National Archives: Records of the Office of the Chief Signal Officer)
Col. Horace F. Spurgin (MP-14) probably around the time of turn over to U.S. Navy (photo from All Hands magazine, March 1950)