A civilian investigation into the deaths of 15 persons whose corpses were found in an abandoned mine last November has identified 11 as persons "arrested or kidnaped" by Chile's national police shortly after the 1973 coup.

The report, yet unpublished here, is the first by a court-appointed official indicating direct responsibility of the military government for at least some of the hundreds of leftists unaccounted for after the right-wing coup.

Investigator Adolfo Banados Cuadra concluded that the 15 persons were last seen alive in the custody of para-military police Capt. Lautaro Castro and that his account - that they were gunned down by unknown assailants - was false.

The report, obtained by Washington Post correspondent Charles A. Krause, was submitted two months ago to military authorities for followup action. It said none of the bodies had bullet wounds.

Publication of the report in Chile would be extremely embarrassing for the military junta, which has denied any role in the disapperance of so many leftists. The Catholic Church's human rights group lists more than 600 such victims.

The report was to have appeared in the magazine Hoy this week but the government suspended publication for two months. Former president Eduardo Frei charged that one reason for the suspension was to prevent appearance of the court documents.