JOHANNESBURG (Reuters) - South Africa's headline consumer inflation quickened to 4.6 percent year-on-year in June from 4.4 percent in May, data from Statistics South Africa showed on Wednesday. On a month-on-month basis, inflation rose to 0.4 percent in June from 0.2 percent in May. Core inflation, which excludes the prices of food, non-alcoholic beverages, petrol and energy, fell to 4.2 percent year-on-year from 4.4 percent, while on a month-on-month basis it rose to 0.2 percent from 0.0 percent previously. (Reporting by Olivia Kumwenda-Mtambo; Editing by James Macharia)