sentences:  The city is located in the middle of the Świętokrzyskie Mountains (Holy Cross Mountains), on the banks of the Silnica River, in the northern part of the historical Polish province of Lesser Poland.The history of Kielce dates back over 900 years and the exact date when the town was founded remains unknown.Kielce was once an important centre of limestone mining and the vicinity is famous for its natural resources like copper, lead and iron, which, over the centuries, were exploited on a large scale.