Whip the whipping cream in a chilled bowl until soft peaks form.
Place the gelatin in a small heat proof bowl. Add the orange juice and cook in a water bath, stirring until the gelatin is dissolved. Or place in a microwave safe dish and cook for about a minute, checking often. Place the mango puree and the gelatin in a large bowl. Carefully fold in the whipped cream. Transfer mixture to a plastic dish and place in freezer. Chill for at least 4 hours or until frozen. To serve, scoop portions of mousse into ice cream dishes. Garnish with mint sprigs and orange wedges.