The spade is a charm, not a coin, and probably not ancient.
The one coin with legible inscriptions (the one on the right) is from the reign of the Xianfeng emperor (1850-1861), with inscription "Xian Feng Zhong Bao" (Xianfeng large coin). This is a multiple-cash coin. I assume the others are of similar date.
Xianfeng was emperor during the Taiping Rebellion, and the Empire suffered from inflationary problems as a result of losing against the rebels. Iron multiple-cash coins were produced as the rebels had occupied most of the copper-producing territories. Your iron cash probably weighs about the same as two regular cash coins, but would have a face value of 10 cash.
Some examples of iron 10-cash coins are on
this Zeno.ru database page. The denomination and mintmark are on the other side of the coin from what we can see in that picture.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis